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Readers response: How do you handle changes in energy levels as you age?

As we get older, our levels of energy, ability and agility can slowly start to decrease, making us change our day-to-day lifestyles. We asked our readers how they handle these changes, and the response was overwhelming. Here's what they said. Margo Courtney - Eat clean and healthy and your body will reward you with heaps of energy and vitality. I have a very big green smoothie most days as one of my 2 meals, along with 2 litres of water a day, and I don't even need much sleep. Ron Stubbs - Up at 8am, can’t be late for my walk in the sun, and feeling great. Don’t need afternoon snooze then. I’m 77. Kristeen Bon - I don’t handle them. I flop on the couch most afternoons for a quick five minute interior eye check! Sylvia Brice - I have an autoimmune disease so my levels of energy are way down. I do what l can in small bursts and rest when l need to. Luckily l read and craft so can always do them. It's very hard to adapt but that's life and l am so much better for off than younger people with my disease. Think positive. Judie Fisher - Do chores in small stretches, and have regular breaks. Diane Green - Adjust. I do what I can, and what I can't just has to wait. Raymond Richards - As they told us at the heart clinic, if you have something you HAVE to do - do it first. Janis St George - Listen to your body - rest awhile when you need to. Kaylene Samuels - Have a SCAN..... Seniors Compulsory Afternoon Nap. Image credits: Shutterstock

Body

Walking or running: for the same distance, which consumes more energy?

<div class="theconversation-article-body"><a href="https://theconversation.com/profiles/clement-lemineur-1529211">Clément Lemineur</a>, <a href="https://theconversation.com/institutions/universite-cote-dazur-2917">Université Côte d’Azur</a>; <a href="https://theconversation.com/profiles/clement-naveilhan-1495411">Clément Naveilhan</a>, <a href="https://theconversation.com/institutions/universite-cote-dazur-2917">Université Côte d’Azur</a>, and <a href="https://theconversation.com/profiles/francois-dernoncourt-1495410">François Dernoncourt</a>, <a href="https://theconversation.com/institutions/universite-cote-dazur-2917">Université Côte d’Azur</a> It’s Monday morning, the alarm goes off and it’s already 7:30 a.m. – and you’re 30 minutes late. Normally you need 45 minutes to walk the 3 kilometres to work, but this morning you’ll be running for 20 minutes. Yes, but by lunchtime you’re feeling more tired and you have the impression that you’ve expended more energy than usual on the trip. Yet you’ve covered the same distance as on the other days. How can this be? The calorie expenditure associated with any activity is called the “metabolic cost”, and corresponds to the energy consumed by our organs to cover a given distance. This metabolic cost can be determined by analysing the oxygen our bodies consume and the carbon dioxide they produce, we can estimate the amount of energy expended, and thus the metabolic cost. It was using this method that <a href="https://pubmed.ncbi.nlm.nih.gov/692303/">researchers had already answered our question back in the 1970s</a>. Perhaps not surprisingly, running consumes more energy than walking for the same distance covered. But why? <h2>Energy lost when running</h2> Imagine you’re watching someone running. Now look closely at the vertical movement (up and down) of their pelvis and head. As you can see from the diagram below, when we run, the distance that our body moves up and down is greater than when we walk. To produce this vertical movement, the muscles of the lower limbs have to generate more force, and that consumes more energy, yet doesn’t bring us any closer to our destination. So when running, part of the energy expended is used to move our bodies <a href="https://pubmed.ncbi.nlm.nih.gov/16029949/">upward rather than forward</a>. The energy needed to cover those 3 km is therefore higher for running than for walking. <figure class="align-center zoomable"><a href="https://images.theconversation.com/files/602769/original/file-20240625-18-xilv63.png?ixlib=rb-4.1.0&q=45&auto=format&w=1000&fit=clip"><img src="https://images.theconversation.com/files/602769/original/file-20240625-18-xilv63.png?ixlib=rb-4.1.0&q=45&auto=format&w=754&fit=clip" sizes="(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px" srcset="https://images.theconversation.com/files/602769/original/file-20240625-18-xilv63.png?ixlib=rb-4.1.0&q=45&auto=format&w=600&h=287&fit=crop&dpr=1 600w, https://images.theconversation.com/files/602769/original/file-20240625-18-xilv63.png?ixlib=rb-4.1.0&q=30&auto=format&w=600&h=287&fit=crop&dpr=2 1200w, https://images.theconversation.com/files/602769/original/file-20240625-18-xilv63.png?ixlib=rb-4.1.0&q=15&auto=format&w=600&h=287&fit=crop&dpr=3 1800w, https://images.theconversation.com/files/602769/original/file-20240625-18-xilv63.png?ixlib=rb-4.1.0&q=45&auto=format&w=754&h=361&fit=crop&dpr=1 754w, https://images.theconversation.com/files/602769/original/file-20240625-18-xilv63.png?ixlib=rb-4.1.0&q=30&auto=format&w=754&h=361&fit=crop&dpr=2 1508w, https://images.theconversation.com/files/602769/original/file-20240625-18-xilv63.png?ixlib=rb-4.1.0&q=15&auto=format&w=754&h=361&fit=crop&dpr=3 2262w" alt="Illustration of the oscillations of running and walking" /></a><figcaption>Running involves much greater vertical oscillation of the centre of mass than walking. This is the main reason why running consumes more energy than walking for the same distance covered. François Dernoncourt, Fourni par l'auteur</figcaption></figure> This difference between walking and running is not confined to what happens during the activity itself. In fact, each physical exercise causes a delayed expenditure of energy, which is added to the expenditure during the activity. Taking this into account, it’s once again running that uses more energy than walking. Immediately after running your 3 km, the increased energy consumption (compared with resting) lasts for several minutes, mainly because of the increase in body temperature and the replenishment of energy reserves. This additional expenditure after running is <a href="https://pubmed.ncbi.nlm.nih.gov/22446673/">more than twice that observed after walking</a>, due to the difference in intensity between the two exercises. <h2>It all depends on speed</h2> Running therefore involves a higher calorie expenditure than walking for the same distance covered. But this is on condition that the walking speed considered is “normal” (around 5 km/h). So, if we walk very slowly, it will take us so long to cover the 3 km that the calorie expenditure will be greater in the end. This is because the body expends a certain amount of energy per unit of time no matter what, regardless of the activity performed (known as the “basal metabolic rate”). The same applies if the walking speed is very fast (<a href="https://pubmed.ncbi.nlm.nih.gov/29925582/">more than 8 km/h</a>): running is more energy-efficient. Here, the coordination required to walk at such a speed means that we need to activate our muscles more, without being able to take advantage of the elasticity of our tendons, as is the case with running. Moreover, we have a very precise intuitive perception of the energy efficiency of a particular style of movement. If we’re on a treadmill whose speed gradually increases, the point at which we spontaneously switch from walking to running coincides with the <a href="https://www.sciencedirect.com/science/article/pii/S096663622100120X">moment when it would become more energy-consuming to walk than to run</a>. <figure class="align-center zoomable"><a href="https://images.theconversation.com/files/604700/original/file-20240703-17-4dlrj.jpg?ixlib=rb-4.1.0&q=45&auto=format&w=1000&fit=clip"><img src="https://images.theconversation.com/files/604700/original/file-20240703-17-4dlrj.jpg?ixlib=rb-4.1.0&q=45&auto=format&w=754&fit=clip" sizes="(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px" srcset="https://images.theconversation.com/files/604700/original/file-20240703-17-4dlrj.jpg?ixlib=rb-4.1.0&q=45&auto=format&w=600&h=395&fit=crop&dpr=1 600w, https://images.theconversation.com/files/604700/original/file-20240703-17-4dlrj.jpg?ixlib=rb-4.1.0&q=30&auto=format&w=600&h=395&fit=crop&dpr=2 1200w, https://images.theconversation.com/files/604700/original/file-20240703-17-4dlrj.jpg?ixlib=rb-4.1.0&q=15&auto=format&w=600&h=395&fit=crop&dpr=3 1800w, https://images.theconversation.com/files/604700/original/file-20240703-17-4dlrj.jpg?ixlib=rb-4.1.0&q=45&auto=format&w=754&h=497&fit=crop&dpr=1 754w, https://images.theconversation.com/files/604700/original/file-20240703-17-4dlrj.jpg?ixlib=rb-4.1.0&q=30&auto=format&w=754&h=497&fit=crop&dpr=2 1508w, https://images.theconversation.com/files/604700/original/file-20240703-17-4dlrj.jpg?ixlib=rb-4.1.0&q=15&auto=format&w=754&h=497&fit=crop&dpr=3 2262w" alt="" /></a><figcaption>Modelling of metabolic cost (kilocalories expended per kilogram per kilometre covered) as a function of speed (kilometres per hour) for walking and running. The curves cross at a certain speed (purple line; around 8 km/h): this means that above this speed, walking becomes more energy-intensive than running. It’s at around this threshold speed that people spontaneously switch from walking to running. François Dernoncourt, Adapted from Summerside et al, Fourni par l'auteur</figcaption></figure> In conclusion, because of greater oscillation of the centre of mass and increased energy expenditure after exercise, running to work is more energy-intensive than covering the same distance by walking. But remember, whether you choose to walk or run to work, the most important thing is that you’re already saving energy!<img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/233943/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/clement-lemineur-1529211">Clément Lemineur</a>, Doctorant en Sciences du Mouvement Humain, <a href="https://theconversation.com/institutions/universite-cote-dazur-2917">Université Côte d’Azur</a>; <a href="https://theconversation.com/profiles/clement-naveilhan-1495411">Clément Naveilhan</a>, Doctorant en Sciences du Mouvement Humain, <a href="https://theconversation.com/institutions/universite-cote-dazur-2917">Université Côte d’Azur</a>, and <a href="https://theconversation.com/profiles/francois-dernoncourt-1495410">François Dernoncourt</a>, Doctorant en Sciences du Mouvement Humain, <a href="https://theconversation.com/institutions/universite-cote-dazur-2917">Université Côte d’Azur</a> Image credits: Shutterstock This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/walking-or-running-for-the-same-distance-which-consumes-more-energy-233943">original article</a>. </div>

Body

Calories and kilojoules: how do we know the energy content of food, and how accurate are the labels?

<a href="https://theconversation.com/profiles/lauren-ball-14718">Lauren Ball</a>, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a>; <a href="https://theconversation.com/profiles/emily-burch-438717">Emily Burch</a>, <a href="https://theconversation.com/institutions/southern-cross-university-1160">Southern Cross University</a>, and <a href="https://theconversation.com/profiles/katelyn-barnes-1238606">Katelyn Barnes</a>, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a> Everything we consume contains energy our bodies use to move, grow and maintain health. To work out how much energy is in different foods and drinks, we need to first look at a few core concepts. Firstly, you’ve probably heard of the units of measurement for energy – calories – as well as the metric equivalent, which is joules. One calorie is defined as the amount of energy required to raise the temperature of 1 gram of water by 1℃. In human nutrition, the amounts of energy needed to maintain health, and to fuel a body, are much larger than the tiny singular calories used to heat up a gram of water. So, the term “calorie” in nutrition commonly refers to a <a href="https://www.sciencedirect.com/science/article/pii/S0022316622085546">kilocalorie</a> (or kcal), which is 1,000 calories. When you see the word “calories” on a nutrition label, it’s likely referring to kcals. The energy stored in food and drinks is released when the body breaks down one or more of the four macronutrients inside the food (carbohydrates, proteins, fats, alcohol). The body then uses that energy for activities such as keeping our heart beating, our lungs breathing and our muscles moving. When energy in food is estimated, it is the amount of energy food and drinks provide for these bodily processes. The four macronutrients provide <a href="https://www.sciencedirect.com/science/article/pii/S0002916522039454">different amounts of energy</a>: <ol> <li>1 gram of carbohydrate provides about 4 kcal of energy</li> <li>1 gram of fat provides about 9 kcal of energy</li> <li>1 gram of protein provides about 4 kcal of energy</li> <li>1 gram of alcohol provides about 7 kcal of energy.</li> </ol> <h2>How are calories estimated?</h2> There are two ways to estimate the amount of energy in food and drinks. The first is called “bomb calorimetry”. This gold-standard method involves placing a small sample of food or drink inside a device known as a bomb calorimeter. The food is burned in the presence of oxygen, releasing heat. The amount of heat released is directly related to the amount of energy in the food, allowing a calculation to be made. This method is most commonly used for foods rich in fats and is considered the most reliable (but expensive) method. The second method, the Atwater system, is a much less expensive method for estimating energy content. It is more commonly used when calculating energy of most food and drinks sold in supermarkets. Named after legendary food researcher <a href="https://www.sciencedirect.com/science/article/pii/S0022316622065336">Wilbur Atwater</a>, this system uses a standard conversion factor for each macronutrient found in food and drinks. By estimating the amount of each of the four macronutrients, an approximate calculation of the total energy can be made. However, this method requires detailed knowledge of the ingredients within composite foods (such as muesli bars or hamburgers) – which may reduce accuracy. There is also a margin of error to expect with the Atwater system, because it assumes each ingredient is always the same in composition. For example, a cup of oats grown in one part of the country won’t necessarily have the exact same nutritional content as another cup of oats grown elsewhere, due to climate and soil differences. So, this system is an estimation based on an average. Importantly, both methods estimate the amount of energy in food and drinks. But the actual energy our bodies extract from these foods and drinks can vary due to factors such as individual differences in digestion and absorption, as well as food processing and cooking methods. <h2>Why do foods have calories written on them?</h2> In Australia, it’s a <a href="https://www.foodstandards.gov.au/consumer/labelling/panels/Pages/default.aspx">legal requirement</a> for packaged food items to have a nutrition information panel that displays the number of kcal it contains. However, homemade food items sold at places like a fresh market may not be required to provide a nutrition information panel. This will depend on the type of food being sold and the scale of the business operation. Fresh foods such as fruit, vegetables and meat also don’t require a nutrition information panel. To find out the number of kcal in them, you can either run an experiment with a bomb calorimeter or look up an estimated value in an online nutrition database. Food composition databases such as <a href="https://www.calorieking.com/us/en/">CalorieKing</a> compile information about the energy and nutrient content of various foods. Dietitians and other health professionals often use these databases to estimate the energy content of foods to inform dietary recommendations. <h2>Different international standards</h2> Both kJ and kcal refer to energy – they are just two different units of measurements (such as how inches and centimetres are two different units for measuring length). Kilojoules (kJ) is part of the International System of Units (SI). Australia, New Zealand and some parts of Europe use kJ. The United States and the United Kingdom use kcal. To convert between calories and kilojoules you use the conversion factors: <ul> <li>1 kcal = 4.184 kJ</li> <li>1 kJ = 0.24 kcal (about ¼).</li> </ul> For example, if you have a packet of chips with an energy content of 200 kcal, you can convert it to kJ as follows: 200 kcal × 4.184 = 836.8 kJ. As for how many calories are acceptable to eat, the Australian Guidelines for Healthy Eating estimate the average adult requires about 7,000kJ or 1,670Kcal every day. However, differences in age, gender, size, health and physical activity will influence how much energy a person needs. To estimate your personal energy requirements, you can use this <a href="https://www.eatforhealth.gov.au/nutrient-reference-values/nutrients-dietary-energy-calculator#results-energy">nutrients and dietary energy calculator</a>.<img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/211613/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/lauren-ball-14718">Lauren Ball</a>, Professor of Community Health and Wellbeing, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a>; <a href="https://theconversation.com/profiles/emily-burch-438717">Emily Burch</a>, Dietitian, Researcher & Lecturer, <a href="https://theconversation.com/institutions/southern-cross-university-1160">Southern Cross University</a>, and <a href="https://theconversation.com/profiles/katelyn-barnes-1238606">Katelyn Barnes</a>, Postdoctoral Research Fellow, School of Human Movement and Nutrition Sciences, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a> Image credits: Getty Images This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/calories-and-kilojoules-how-do-we-know-the-energy-content-of-food-and-how-accurate-are-the-labels-211613">original article</a>.

Food & Wine

1 in 4 households struggle to pay power bills. Here are 5 ways to tackle hidden energy poverty

<a href="https://energyconsumersaustralia.com.au/news/how-increases-in-energy-prices-are-impacting-consumers#:%7E:text=Energy%2520affordability%2520is%2520not%2520just,in%2520the%2520past%252012%2520months.">One in four Australian households</a> are finding it hard to pay their gas and electricity bills. As winter looms, <a href="https://www.aer.gov.au/news-release/default-market-offer-2023%25E2%2580%259324-draft-determination">energy price rises</a> will make it even harder. Cold homes and disconnections resulting from energy poverty threaten people’s health and wellbeing. <a href="https://www.acoss.org.au/wp-content/uploads/2023/03/ACOSS-cost-of-living-report2-March-2023_web_FINAL.pdf">Income support for welfare recipients</a> and retrofitting homes to make them more thermally efficient – by adding insulation, for example – can ease the burden. And when homes are not too cold or hot, <a href="https://theconversation.com/fuel-poverty-makes-you-sick-so-why-has-nothing-changed-since-i-was-a-child-living-in-a-cold-home-201787">people’s health benefits</a>. This in turn <a href="https://apo.org.au/node/319556">eases pressure on the public health system</a>. However, many people are missing out on assistance as programs often do not recognise their difficulties. Their energy vulnerability is hidden. <h2>What forms does hidden energy poverty take?</h2> <a href="https://www.sciencedirect.com/science/article/pii/S2214629623000737">Our newly published study</a> has revealed six aspects of hidden energy vulnerability. These are: <ol> <li> underconsumption – households limit or turn off cooling, heating and/or lights to avoid disconnections </li> <li> incidental masking – other welfare support, such as rent relief, masks difficulties in paying energy bills </li> <li> some households disguise energy poverty by using public facilities such as showers or pooling money for bills between families </li> <li> some people conceal their hardship due to pride or fear of legal consequences, such as losing custody of children if food cannot be refrigerated because the power has been cut off </li> <li> poor understanding of energy efficiency and the health risks of cold or hot homes adds to the problem </li> <li> eligibility criteria for energy assistance programs may exclude some vulnerable households. For example, people with income just above the welfare threshold are missing out on energy concessions. Energy retailer hardship programs also ignore people who have voluntarily disconnected due to financial hardship. </li> </ol> <h2>5 ways to help these households</h2> Our studies suggest trusted intermediaries such as people working in health, energy and social services can play a vital role in identifying and supporting such households. First, energy efficiency and hardship initiatives may be <a href="https://www.rmit.edu.au/about/schools-colleges/property-construction-and-project-management/research/research-centres-and-groups/sustainable-building-innovation-laboratory/projects/care-at-home-system-improvements">integrated into the My Aged Care in-home care system</a>. Energy poverty risk identification, response and referral could be built into the national service’s assessment form. This could leverage existing client screening processes. The system’s front-line staff could connect at-risk householders with energy counsellors. These counsellors could help people access better energy contracts, concessions, home retrofits and appliance upgrade programs. A new Commonwealth “energy supplement” could help pay for essential energy-related home modifications. This would help avoid My Aged Care funds being diverted from immediate healthcare needs. Second, general practitioners and other health professionals could help identify energy vulnerability among patients with medical conditions of concern. They could also provide letters of support emphasising renters’ health-based need for air conditioners or heaters. Third, energy providers could use household energy data to identify those that seem to be under-consuming or are often disconnected. They could also identify those that are not on “best offer” deals. They could be proactive in checking struggling householders’ eligibility for ongoing energy concessions and one-off debt relief grants offered by states and territories. Energy providers could also make it easier for social housing providers to ensure concessions for tenants renew automatically. Fourth, local councils could use their data to identify at-risk householders. They might include those with a disability parking permit, discounted council rates or in arrears, on the social housing waiting list, Meals on Wheels clients and social housing tenants. Maternal and child health nurses and home and community care workers making home visits could call attention to cold or hot homes. Councils could employ in-house energy counsellors to provide assistance and energy literacy training. Council home maintenance teams could develop bulk-buying, insulation and neighbourhood retrofit programs. Strategies to reduce vulnerability to energy poverty should be part of municipal public health and wellbeing plans. Under these strategies, net-zero-carbon funds set up by states and local councils to reduce emissions could finance targeted housing retrofits. We also suggest setting up a central helpline to improve access to energy assistance via local referrals. Fifth, residential energy-efficiency programs could become more person-centric. For example, we already have <a href="https://www.homescorecard.gov.au/">Residential Efficiency Scorecard</a> audits to assess the thermal quality of a home. These audits could also explore whether concessions and better energy deals are available to the household. <h2>Building capacity at all levels</h2> <a href="https://cur.org.au/cms/wp-content/uploads/2021/08/tackling-hidden-energy-final.pdf">Capacity-building strategies</a> are needed at all levels – individual, community and government – to overcome the <a href="https://www.sciencedirect.com/science/article/pii/S2214629623000737">challenges</a> of reducing energy poverty. Current obstacles include the competing priorities of service providers, lack of time and resources, and <a href="https://www.sciencedirect.com/science/article/abs/pii/S2214629622003553">poor co-ordination between siloed</a> programs and services. Access to essential energy services should be part of state and local governments’ strategic health plans. Housing, energy and health departments could work together to include housing retrofits in preventive health programs. A comprehensive approach is needed to overcome hidden energy poverty. It must include public education, integrated services and well-funded energy-efficiency programs. Regulatory reforms and ongoing funding are both needed to improve the availability of energy-efficient, affordable homes for tenants. Our suggested strategies start with improving the skills and knowledge of trusted intermediaries. Doctors, social workers, housing officers, community nurses and volunteers can play a central role. Using these front-line professionals to help identify and act on energy poverty offers a novel, cost-effective and targeted solution. This article originally appeared on <a href="https://theconversation.com/1-in-4-households-struggle-to-pay-power-bills-here-are-5-ways-to-tackle-hidden-energy-poverty-204672" target="_blank" rel="noopener">The Conversation</a>. Images: Getty

Home Hints & Tips

Building and construction emissions and energy use reaches record levels

Despite improvements in energy efficiency, greenhouse pollution levels from the building and construction sector reached an all-time high in 2021. A new report on the building and construction sector by the United Nations Environment Programme released for COP27 found energy demand in buildings – for heating, cooling, lighting and equipment – increased by 4% from 2020 levels. As a result, the sector’s emissions increased 5% compared to 2020. While the increase partly reflects a re-bound in building and construction activities after the pandemic, energy and emissions levels were also above 2019 levels. This is significant because the sector accounts for around a third of total energy demand, the report says. The UN Secretary General Antonio Guterres told the opening forum of COP27 that the future of the planet is in our hands. “…and the clock is ticking. We are in the fight of our lives. And we are losing. Greenhouse gas emissions keep growing. Global temperatures keep rising. And our planet is fast approaching tipping points that will make climate chaos irreversible. “We are on a highway to climate hell with our foot still on the accelerator. “ With the release of the report, UNEP executive director, Inger Andersen added: “If we do not rapidly cut emissions in line with the Paris Agreement, we will be in deeper trouble.” The UNEP report argues investments in energy efficiency must be sustained in the face of growing crises – such as the war in Ukraine and rising energy and living costs – to help with reducing energy demand, avoiding greenhouse gas pollution and reducing energy cost volatility. “The solution may lie in governments directing relief towards low and zero-carbon building investment activities through financial and non-financial incentives,” Andersen says. Also critical to reducing the sector’s emissions are including buildings in climate pledges under the Paris Agreement – known as Nationally Determined Contributions – and mandatory building energy codes. The report’s recommendations include: building coalitions of stakeholders in support of sustainable buildings, governments introducing mandatory building energy codes and government policies, increasing investment in energy efficiency and commitments from industry. <img id="cosmos-post-tracker" style="opacity: 0; height: 1px!important; width: 1px!important; border: 0!important; position: absolute!important; z-index: -1!important;" src="https://syndication.cosmosmagazine.com/?id=222598&title=Building+and+construction+emissions+and+energy+use+reaches+record+levels" width="1" height="1" /> <div id="contributors"> <a href="https://cosmosmagazine.com/earth/building-emissions-reach-record-levels/" target="_blank" rel="noopener">This article</a> was originally published on Cosmos Magazine and was written by Petra Stock. Image: Getty Images </div>

Real Estate

Tips to save energy in the kitchen

One room in the house where big energy savings can be made easily is perhaps the least expected: the kitchen. Here’s what to do to cut down on those power bills. Refrigerator <ul> <li>Ensure door seals are working effectively by placing a piece of paper between the seal and door. If the paper moves in and out, your seal isn’t doing its jobs. Adjust the door or replace seals.</li> <li>Defrost fridge and freezer regularly. Frost build up should never be more than half a centimetre.</li> <li>Refrigerators work most effectively if they are mostly full. Make sure there’s enough room between foods for air to circulate.</li> <li>Don't keep your refrigerator or freezer too cold. The recommended temperatures are between 0°C to 4°C for fresh food, close to -18°C for the freezer and close to 0°C for the chiller compartment.</li> <li>Know the contents of your fridge so you don’t spend unnecessary time with the fridge door wide open. It’s drilled into you when you’re kids but it’s always worth remembering: the less you open the door, the less electricity is used.</li> <li>If you are going on holidays for an extended period of time, it may be worth turning off you refrigerator. </li> </ul> Oven, rangehood and cooktops <ul> <li>Clean door seals regularly and check for signs of wear. Replace flat or split door seals.</li> <li>Regularly clean surfaces for full heating benefits.</li> <li>Turn off the rangehood lights when not needed and use exhaust fan on the lowest speed. </li> </ul> Dishwasher <ul> <li>Most of the energy used by a dishwasher is for water heating. Check the manual to see if your dishwasher has internal heating elements that will allow you to set the water heater to a lower temperature.</li> <li>Only run dishwashers when full but not overloaded.</li> <li>Scrape, don’t rinse, leftover food on your plates. </li> </ul> Other <ul> <li>Small appliances like electric kettles, toasters and grills generally provide better value than using the stove or oven.</li> <li>Place the faucet level on the kitchen sinks on cold. Placing the tap on hot position draws hot water even though you are not using it. </li> </ul> Image credits: Getty Images

Home & Garden

Simple tricks to reduce your winter energy bills

It’s that time of the year when the temperature drops and your energy bills start to go in the opposite direction – up! Stay warm and reduce your bills with these simple tricks to help you save energy. Winter is a time when we love to hibernate at home and stay toasty warm but the impact this can have on the electricity bill can be enormous. Having said that, it’s possible to stay warm and reduce the chill on your hip pocket with smart ways of keeping your home and yourself warm during winter. Rug up An easy way to save electricity and stay warm in winter is to put on suitable clothing. A big woolly jumper, warm pants and indoor slippers are not only comfortable for relaxing around the home, they’ll also keep you toasty warm. While you don’t have to resort to wearing a big coat or jacket inside your own home, it’s a good idea to put on an extra couple of layers and save having to switch on the heater. However, don’t endure being cold for the sake of not putting on your heater. Find what works for you, as long you’re comfortable and warm. Seal your home Chilly draughts from poorly sealed windows and doors can be both a nuisance and account for a big percentage of heat loss from naturally insulated rooms or the heater. Keep the heat inside by sealing any gaps and cracks in external walls, floors and the ceiling. You can seal external doors with draught stoppers or those classic door snakes at the bottom of doors, and install weather stripping around the frames. Load up on blankets Who needs an electric blanket when you can add any number of layers to your bed? It can be duvets, doonas, quilts and comforters, just keep layering until your bed is a warm haven. A good tip is when you’re about to go to bed, to get the same instant warmness as an electric blanket, heat a hot water bottle and pop it between the sheets. While it won’t heat the entire bed evenly, it can make the bed feel warmer while your body adjusts to the enclosed space. Let the sun in Winter can sometimes offer up a surprise in the form of a clear blue sky and some warming sunlight. When it does, open up the windows and doors (if there’s no cool breeze) and allow the natural rays to heat your home naturally. Shop around for energy providers This is the best way to make sure you’re getting a good deal on your energy usage. Depending on what state you live in, you should be able to find a range of energy retailers offering competitive prices for their services. Image: Getty Images

Money & Banking

Food and drinks are getting sweeter

Humans have an evolutionary preference for sweetness. Sweet foods, like fruit and honey, <a href="https://theconversation.com/a-taste-for-sweet-an-anthropologist-explains-the-evolutionary-origins-of-why-youre-programmed-to-love-sugar-173197" target="_blank" rel="noopener">were an important energy source</a> for our ancestors. However, in the modern world, sweetened foods are readily available, very cheap and advertised extensively. Now, we are consuming too much sugar in foods and drinks – the kind that is added rather than sugar that is naturally occurring. Consuming too much added sugar is <a href="https://www.health.harvard.edu/heart-health/the-sweet-danger-of-sugar#:%7E:text=%22The%20effects%20of%20added%20sugar,Hu." target="_blank" rel="noopener">bad news</a> for health. It is linked to <a href="https://onlinelibrary.wiley.com/doi/10.1111/obr.12040" target="_blank" rel="noopener">obesity</a>, <a href="https://www.gov.uk/government/publications/sacn-carbohydrates-and-health-report" target="_blank" rel="noopener">type 2 diabetes and tooth decay</a>. Because of these health concerns, manufacturers started using non-nutritive sweeteners to sweeten food as well. These sweeteners contain little to no kilojoules and include both artificial sweeteners, such as aspartame, and those that come from natural sources, such as stevia. Our research, <a href="https://www.cambridge.org/core/journals/public-health-nutrition/article/global-trends-in-added-sugars-and-nonnutritive-sweetener-use-in-the-packaged-food-supply-drivers-and-implications-for-public-health/A6375EB569DCDA4899730EC40C69D1CC" target="_blank" rel="noopener">published here</a>, shows the amount of added sugars and non-nutritive sweeteners in packaged foods and drinks has grown a lot over the last decade. This is especially true in middle-income countries, such as China and India, as well as in the Asia Pacific, including Australia. <h2>From lollies to biscuits to drinks</h2> Using market sales data from around the globe, we looked at the quantity of added sugar and non-nutritive sweeteners sold in packaged foods and drinks from 2007 to 2019. We found per person volumes of non-nutritive sweeteners in drinks is now 36% higher globally. Added sugars in packaged food is 9% higher. Non-nutritive sweeteners are most commonly added to confectionery. Ice creams and sweet biscuits are the fastest-growing food categories in terms of these sweeteners. The expanding use of added sugars and other sweeteners over the last decade means, overall, our packaged food supply is getting sweeter. Our analysis shows the amount of added sugar used to sweeten drinks has increased globally. However, this is largely explained by a 50% increase in middle-income countries, such as China and India. Use has decreased in high-income countries, such as Australia and the United States. <a href="https://www.hsph.harvard.edu/nutritionsource/carbohydrates/added-sugar-in-the-diet/#:%7E:text=The%20AHA%20suggests%20a%20stricter,of%20sugar%20for%20most%20men." target="_blank" rel="noopener">It is recommended</a> men consume less than nine teaspoons of sugar a day, while women should have less than six. However, because sugar is added to so many foods and drinks, over half of <a href="https://www.abs.gov.au/ausstats/abs@.nsf/lookup/4364.0.55.011main+features12011-12#:%7E:text=In%202011%2D12%2C%20Australians%20consumed,from%20honey%20and%20fruit%20juice." target="_blank" rel="noopener">Australians exceed recommendations</a>, eating an average of 14 teaspoons a day. The shift from using added sugar to sweeteners to sweeten drinks is most common in carbonated soft drinks and bottled water. The World Health Organization is <a href="https://www.who.int/news-room/articles-detail/online-public-consultation-draft-guideline-on-use-of-non-sugar-sweeteners" target="_blank" rel="noopener">developing guidelines</a> on the use of <a href="https://www.who.int/publications/i/item/9789240046429" target="_blank" rel="noopener">non-sugar sweeteners</a>. <h2>Rich and poor countries</h2> There is a difference in added sugar and sweetener use between richer and poorer countries. The market for packaged food and beverages in high-income countries has become saturated. To continue to grow, large food and beverage corporations are <a href="https://onlinelibrary.wiley.com/doi/abs/10.1111/obr.13126" target="_blank" rel="noopener">expanding into middle-income countries</a>. Our findings demonstrate a double standard in the sweetening of the food supply, with manufacturers providing less sweet, “healthier” products in richer countries. <h2>Unexpected consequences of control</h2> To reduce the health harms of high added sugar intakes, many governments have acted to curb their use and consumption. Sugar levies, education campaigns, advertising restrictions and labelling <a href="https://www.cambridge.org/core/journals/nutrition-research-reviews/article/abs/drivers-trends-and-dietary-impacts-of-nonnutritive-sweeteners-in-the-food-supply-a-narrative-review/32B903F1CAB239800F2C98279541B4C0" target="_blank" rel="noopener">are among these measures</a>. But such actions can encourage manufacturers to partially or completely substitute sugar with non-nutritive sweeteners to avoid penalties or cater to evolving population preferences. In our study, we found regions with a higher number of policy actions to reduce sugar intakes had a significant increase in non-nutritive sweeteners sold in drinks. <h2>Why is this a problem</h2> While the harms of consuming too much added sugar are well known, relying on non-nutritive sweeteners as a solution also carries risk. Despite their lack of dietary energy, recent <a href="https://www.who.int/publications/i/item/9789240046429" target="_blank" rel="noopener">reviews</a>, suggest consuming non-nutritive sweeteners may be linked with <a href="https://www.who.int/publications/i/item/9789240046429" target="_blank" rel="noopener">type 2 diabetes and heart disease</a> and can disrupt the <a href="https://academic.oup.com/advances/article/10/suppl_1/S31/5307224" target="_blank" rel="noopener">gut microbiome</a>. And because they are sweet, ingesting non-nutritive sweeteners <a href="https://www.who.int/publications/i/item/9789240046429" target="_blank" rel="noopener">influences our palates</a> and encourages us to want more sweet food. This is of particular concern for children, who are still developing their lifelong taste preferences. Additionally, certain non-nutritive sweeteners are considered <a href="https://www.sciencedirect.com/science/article/abs/pii/S0147651318313368" target="_blank" rel="noopener">environmental contaminants</a> and are not effectively removed from wastewater. Non-nutritive sweeteners are only found in <a href="https://www.cambridge.org/core/journals/public-health-nutrition/article/ultraprocessed-foods-what-they-are-and-how-to-identify-them/E6D744D714B1FF09D5BCA3E74D53A185" target="_blank" rel="noopener">ultra-processed foods</a>. These foods are industrially made, contain ingredients you would not find in a home kitchen, and are designed to be “hyper-palatable”. Eating more ultra-processed foods is linked with more <a href="https://www.mdpi.com/2072-6643/12/7/1955" target="_blank" rel="noopener">heart disease, type 2 diabetes, cancer and death</a>. <a href="https://theconversation.com/ultra-processed-foods-are-trashing-our-health-and-the-planet-180115" target="_blank" rel="noopener">Ultra-processed</a> foods are also <a href="https://www.thelancet.com/journals/lanplh/article/PIIS2542-5196(20)30177-7/fulltext" target="_blank" rel="noopener">environmentally harmful</a> because they use significant resources such as energy, water, packaging materials and plastic waste. Foods that contain sweeteners can receive a “health halo” if they don’t contain sugar, misleading the public and potentially displacing nutritious, whole foods in the diet. <h2>Focus on nutrition</h2> When making policy to improve public health nutrition, it is important to consider unintended consequences. Rather than focusing on specific nutrients, there is merit in advocating for policy that considers the broader aspects of food, including cultural importance, level of processing and environmental impacts. Such policy should promote nutritious, minimally processed foods. We need to closely monitor the increasing sweetness of food and drinks and the growing use of added sugars and non-nutritive sweeteners. It is likely to shape our future taste preferences, food choices and human and planetary health. This article originally appeared on <a href="https://theconversation.com/food-and-drinks-are-getting-sweeter-even-if-its-not-all-sugar-its-bad-for-our-health-187605" target="_blank" rel="noopener">The Conversation</a>. Image: Shutterstock

Body

How to choose the best solar panels for your home

The solar industry has seen a rapid growth over the past decade and become the cleanest, greenest and cheapest source of electricity. As electricity bills continue to rise at an exponential level, switching to solar makes sense. With many solar providers out there offering different services for widely differing costs, it's easy to get lost in the semantics of switching to solar. Luckily, Beau Savage, Co-Founder of <a href="https://smartenergy.co/au/">Smart Energy</a>, has shared his top tips to consider when finding the right solar provider for your home. Evaluate your home The first step is to figure out if solar power is right for you. There are a few reasons why solar might not suit, including renters, apartment-dwellers, and anyone who lives in a shady spot might not be the ideal candidate for solar power. Luckily there are other ways to reduce your carbon footprint. “If conditions don’t suit, it might be better to invest in a 100 per cent carbon neutral energy plan,” says Beau. Do your research Shopping for solar is no different to buying new furniture. It’s important to shop around for the best deal by looking at user reviews, comparing prices and services, and talking to experts before locking down a provider. Beau says, “The only negative reviews you want to see appearing on a good company should be from those who delayed getting and wished they’d done it sooner.” Find the right company While there’s nothing wrong with prioritising affordability and cost comparison, be aware that low costs can occasionally translate to poor customer service and unreliable installers. According to Beau, “For the best long term results, choose a solar company who uses local installers so that if there is a problem, there will always be someone ready to immediately fix the issue.” Find the right spot When it comes to solar power, location is key. The last thing you want is to discover that your installer has placed the panels in a bad spot, which only leads to more costs to correct the error. “When having an initial consultation it is essential to ask whether or not the company you are talking to sends trained engineers who can look at your roof, its shading and sunlight levels. This will ensure that you will get the most out of your solar system.” In order to get the most of your solar power, make sure there are no obstructions to your panels, and be sure to monitor the system’s performance to make sure you’re getting the very best green energy. Image credits: Getty Images

Home & Garden

How to get out of the energy crisis, according to top technology experts

Low-emissions technology and renewable energy are the way out of the current energy crisis, according to the Australian Academy of Technology and Engineering. In its <a href="https://www.atse.org.au/news-and-events/article/here-and-now-the-state-of-low-emissions-technology-in-australia" target="_blank" rel="noreferrer noopener">new report</a> on the state of low-emissions technology, the academy emphasises that existing renewable energy sources – like solar, wind, batteries and pumped hydro – are mature technologies which will provide cheaper and more reliable energy in the long term. While they’re already a big part of our energy mix, it’s going to take more work before they’re dominant. According to the academy, Australia needs more policy, big infrastructure investments, and broad social support to transition completely to these technologies. “By deploying clean energy on the huge scale required to replace fossil fuels, we can eliminate nearly three quarters of global emissions and enhance global energy security,” says academy fellow Katherine Woodthorpe, former director of the Australian Renewable Energy Agency (ARENA) and Vast Solar. “In Australia, it will also lead to cheaper and more reliable supplier pricing for onshore manufacturers as well as a potentially exportable resource.” Professor Renate Egan, research leader for the University of New South Wales at the Australian Centre for Advanced Photovoltaics says: “Australia-wide, we already get 32% of our electricity from renewables. And that’s actually doubled in five years. “We need that to double again. We can do it possibly in five years, but at least in 10 years.” At the centre of the transition lies our <a href="https://www.atse.org.au/news-and-events/article/here-and-now-the-state-of-low-emissions-technology-in-australia" target="_blank" rel="noreferrer noopener">energy grid</a>. Formerly something that ran off a handful of big energy producers, the grid is becoming more and more complicated with the addition of smaller and more diverse energy sources – from rooftop solar, to large batteries and offshore wind farms. <figure class="wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio"> <div class="wp-block-embed__wrapper"> <div class="entry-content-asset"> <div class="embed-wrapper"> <div class="inner"><iframe title="Cosmos Shorts: What is the grid?" src="https://www.youtube.com/embed/KmCXCXa5loA?feature=oembed" width="500" height="281" frameborder="0" allowfullscreen="allowfullscreen"></iframe></div> </div> </div> </div> </figure> Egan refers to the modernising grid as an “internet of energy”. “With [energy] being generated in all different places and flowing in all different directions, we really need better monitoring, measuring and analysis of what’s going on, to allow us to make smart decisions,” says Egan. Fortunately, the technology now exists to manage this change too. “You’ll need smart sensors deployed pretty much everywhere producing a huge volume of data, with smart software to analyse and make use of that data,” says academy fellow George Maltabarow, the former managing director of Ausgrid. Academy fellow Professor Lachlan Blackhall, head of the battery storage and grid integration program at the Australian National University says: “This trend of distributed energy resources is actually happening globally. <div class="newsletter-box"> <div id="wpcf7-f6-p197575-o1" class="wpcf7" dir="ltr" lang="en-US" role="form"> </div> </div> “We’re seeing a really significant increase in the decentralisation of all energy systems. But Australia is actually on track to have the most decentralised energy system of anywhere in the world.” Strengthening and diversifying the grid is particularly important, because electricity will be providing more of our energy in general. <figure class="wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio"> <div class="wp-block-embed__wrapper"> <div class="entry-content-asset"> <div class="embed-wrapper"> <div class="inner"><iframe title="Cosmos Shorts: What could our future electricity grid look like?" src="https://www.youtube.com/embed/hGWw3gF7Z9k?feature=oembed" width="500" height="281" frameborder="0" allowfullscreen="allowfullscreen"></iframe></div> </div> </div> </div> </figure> Maltabarow says the transition away from fossil fuels “is going to require electrifying just about everything”. This transition includes household gas supplies – although gas power stations will <a href="https://cosmosmagazine.com/technology/gas-price-energy-crisis/" target="_blank" rel="noreferrer noopener">likely still have a small role to play</a> as a peak transition fuel for the next few decades. <a href="https://cosmosmagazine.com/technology/cosmos-briefing-electric-vehicles/" target="_blank" rel="noreferrer noopener">Electric vehicle</a> batteries could also provide some additional storage space for the grid to use. “We really do have all of the technology that we’re going to need, so it’s really important that we also focus on the social and the economic,” says Blackhall. “One of the key things that we do advocate for is actually an increase in the amount of social science research, in particular, that’s being done to actually go out and understand householder and community expectations and ensure that we have social licence for this very significant energy transition.” Social support is particularly important in the context of the current crisis, where energy prices are 115% higher than previous records, and <a href="https://cosmosmagazine.com/technology/aemo-energy-market-gas-crisi/" target="_blank" rel="noreferrer noopener">trading was temporarily suspended</a> by the Australian Energy Market Operator (AEMO). “The current crisis has been a decade in the making,” says Maltabarow. “In the short to medium term, prices are going to increase. The challenge is to make sure that increase is minimised to the extent that we can.” Academy fellow Alex Wonhas, a member of the NSW Energy Corporation’s advisory board and former head of engineering and system design at AEMO says Australia “has the technologies to avoid a future crisis”. “However, we must act now to lay the foundation of a truly modern energy system,” Wonhas says. “That requires investment in a whole mix of different technologies.” <img id="cosmos-post-tracker" style="opacity: 0; height: 1px!important; width: 1px!important; border: 0!important; position: absolute!important; z-index: -1!important;" src="https://syndication.cosmosmagazine.com/?id=197575&title=How+to+get+out+of+the+energy+crisis%2C+according+to+top+technology+experts" width="1" height="1" /> <div id="contributors"> <a href="https://cosmosmagazine.com/technology/energy-crisis-escape-transition/" target="_blank" rel="noopener">This article</a> was originally published on <a href="https://cosmosmagazine.com" target="_blank" rel="noopener">Cosmos Magazine</a> and was written by <a href="https://cosmosmagazine.com/contributor/ellen-phiddian" target="_blank" rel="noopener">Ellen Phiddian</a>. Ellen Phiddian is a science journalist at Cosmos. She has a BSc (Honours) in chemistry and science communication, and an MSc in science communication, both from the Australian National University. Image: Getty Images </div>

Technology

Keen to retrofit your home to lower its carbon footprint and save energy? Consider these 3 things

If you’re anything like me, you’re increasingly <a href="https://www.abc.net.au/news/2021-09-16/work-from-home-productivity-commission-study/100465258" target="_blank" rel="noopener">working from home</a>, one that was built before energy efficiency measures were introduced in Australia. With temperatures along the east coast plunging and <a href="https://theconversation.com/why-did-gas-prices-go-from-10-a-gigajoule-to-800-a-gigajoule-an-expert-on-the-energy-crisis-engulfing-australia-184304" target="_blank" rel="noopener">power bills skyrocketing</a>, heating (and cooling) our homes is an energy intensive, expensive affair. Almost <a href="https://www.abc.net.au/news/2021-11-04/energy-efficiency-carbon-offset-homes-sharehouse-rentals/100590596" target="_blank" rel="noopener">8 million homes</a> across Australia lack sufficient insulation, use sub-par heating and cooling equipment, or are badly designed. Indeed, these 8 million pre-energy rated homes <a href="http://www.powerhousingaustralia.com.au/resources/" target="_blank" rel="noopener">account for 18% of Australia’s greenhouse gas emissions</a>. And <a href="https://theconversation.com/if-youre-renting-chances-are-your-home-is-cold-with-power-prices-soaring-heres-what-you-can-do-to-keep-warm-184472" target="_blank" rel="noopener">research finds</a> 26% of Australians across all housing types can’t stay warm at least half of the time during winter. Retrofitting this housing stock to be more energy efficient is essential to successfully meet Australia’s target of cutting emissions 43% by 2030, while finding comfort in our future of intensifying climate extremes. <blockquote class="twitter-tweet"> A take-away from the current energy supply squeeze: energy efficiency pays. Whether retrofit or new build, do it to high standards and reap the benefits. Also, we need proper minimum standards in buildings and fleet wide emissions standards for vehicles. — Frank Jotzo (@frankjotzo) <a href="https://twitter.com/frankjotzo/status/1536988473495736320?ref_src=twsrc%5Etfw">June 15, 2022</a></blockquote> My <a href="https://www.intechopen.com/chapters/79914" target="_blank" rel="noopener">research into net-zero emissions retrofitting</a> identifies three broad categories that must be considered when retrofitting existing homes to be more climate friendly: <ol> <li> <a href="https://multicomfort.saint-gobain.co.uk/recommended-level-of-light-into-a-building/" target="_blank" rel="noopener">visual comfort</a>: the sufficient quality, quantity and distribution of light </li> <li> <a href="http://www.greeneducationfoundation.org/green-building-program-sub/learn-about-green-building/1239-thermal-comfort.html" target="_blank" rel="noopener">thermal comfort</a>: determined by the temperature, humidity, air flow and a person’s physical condition </li> <li> energy consumption: the amount of energy we use, and the <a href="https://www.yourhome.gov.au/materials/embodied-energy" target="_blank" rel="noopener">energy used</a> in manufacturing, transporting, constructing, maintaining, and removal of materials to build our homes. </li> </ol> 1. Visual comfort It’s vital to understand how much sunlight the outside and interior of your home is exposed to. One can, accordingly, re-organise interior functions based on the demand for lighting, heating or cooling needs. During summer, spaces used often during the day, such as your home office, could benefit from being in places that receive less direct sunlight, so are cooler. In winter, consider moving your home office set up to a room with higher levels of direct sunlight, where it’s warmer. This will naturally reduce the amount of energy needed to cool or heat these rooms while allowing for comfortable working conditions. Other ways we can find more visual comfort include modifying the size of windows and skylights to let in more sunlight. To diffuse harsh lighting, consider <a href="https://www.geelongaustralia.com.au/common/public/documents/8d37431053e9065-Imap%202-1%20Sunshading.pdf" target="_blank" rel="noopener">adding screens, sun baffles, overhangs, or pergolas</a> over windows. You can also replace your lights with LEDs equipped with linear controllers and motion sensors in places where lights tend to be left on. <a href="https://www.energy.gov.au/households/lighting#:%7E:text=LEDs%20are%20better%20value%20for,bulbs%20ending%20up%20in%20landfill." target="_blank" rel="noopener">LEDs use around 75% less energy than halogen light bulbs</a>. <figure class="align-center zoomable"><a href="https://images.theconversation.com/files/469149/original/file-20220616-11-lzxmcp.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=1000&fit=clip"><img src="https://images.theconversation.com/files/469149/original/file-20220616-11-lzxmcp.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=754&fit=clip" sizes="(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px" srcset="https://images.theconversation.com/files/469149/original/file-20220616-11-lzxmcp.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=600&h=400&fit=crop&dpr=1 600w, https://images.theconversation.com/files/469149/original/file-20220616-11-lzxmcp.jpg?ixlib=rb-1.1.0&q=30&auto=format&w=600&h=400&fit=crop&dpr=2 1200w, https://images.theconversation.com/files/469149/original/file-20220616-11-lzxmcp.jpg?ixlib=rb-1.1.0&q=15&auto=format&w=600&h=400&fit=crop&dpr=3 1800w, https://images.theconversation.com/files/469149/original/file-20220616-11-lzxmcp.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=754&h=503&fit=crop&dpr=1 754w, https://images.theconversation.com/files/469149/original/file-20220616-11-lzxmcp.jpg?ixlib=rb-1.1.0&q=30&auto=format&w=754&h=503&fit=crop&dpr=2 1508w, https://images.theconversation.com/files/469149/original/file-20220616-11-lzxmcp.jpg?ixlib=rb-1.1.0&q=15&auto=format&w=754&h=503&fit=crop&dpr=3 2262w" alt="" /></a><figcaption>Moving your home office to rooms with more sunshine can help you save energy in winter. Unsplash, <a class="license" href="http://creativecommons.org/licenses/by/4.0/" target="_blank" rel="noopener">CC BY</a></figcaption></figure> 2. Thermal comfort Older Australian homes are <a href="https://blog.csiro.au/draught-proof-house/" target="_blank" rel="noopener">incredibly draughty</a>, and a lot of the energy we spend cooling or heating our homes escapes outside due to poor insulation. Retrofitting to improve your home’s natural ventilation can reduce the number of times you need to switch on the heater or air conditioner. <a href="https://www.greenbuilding.org.au/Articles/Sealing-Building-Envelope.htm" target="_blank" rel="noopener">Sealing outside and internal surfaces</a> until they’re airtight is crucial. <a href="https://build.com.au/how-improve-your-homes-insulation" target="_blank" rel="noopener">Different surfaces</a> – whether walls, floors or ceilings – require different methods, types and thicknesses of insulation. Walls, for instance, require a “blow-in” method. This can involve installing cellulose foam or <a href="https://build.com.au/glass-wool-insulation" target="_blank" rel="noopener">glasswool</a> (made from fibreglass) into the wall, via a <a href="https://build.com.au/wall-insulation" target="_blank" rel="noopener">small hole through the wall cavities</a> (for cellulose foam) or laying glasswool batts in wall cavities. Floors, on the other hand, can require insulation panels fitted between timber or steel supports or foam boards. <a href="https://zeroenergyproject.org/build/twelve-steps-affordable-zero-energy-home-construction-design/super-insulate-net-zero-building-envelope/" target="_blank" rel="noopener">Also important</a> is to choose materials and methods that maximise insulation while minimising thermal bridging. A <a href="https://blog.passivehouse-international.org/what-is-a-thermal-bridge/" target="_blank" rel="noopener">thermal bridge</a> is a weak point where heat is lost, such as wall intersections, connecting points of mounting brackets, and even penetration points of electric cables. <figure class="align-center zoomable"><a href="https://images.theconversation.com/files/469147/original/file-20220616-21-adexyd.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=1000&fit=clip"><img src="https://images.theconversation.com/files/469147/original/file-20220616-21-adexyd.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=754&fit=clip" sizes="(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px" srcset="https://images.theconversation.com/files/469147/original/file-20220616-21-adexyd.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=600&h=450&fit=crop&dpr=1 600w, https://images.theconversation.com/files/469147/original/file-20220616-21-adexyd.jpg?ixlib=rb-1.1.0&q=30&auto=format&w=600&h=450&fit=crop&dpr=2 1200w, https://images.theconversation.com/files/469147/original/file-20220616-21-adexyd.jpg?ixlib=rb-1.1.0&q=15&auto=format&w=600&h=450&fit=crop&dpr=3 1800w, https://images.theconversation.com/files/469147/original/file-20220616-21-adexyd.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=754&h=566&fit=crop&dpr=1 754w, https://images.theconversation.com/files/469147/original/file-20220616-21-adexyd.jpg?ixlib=rb-1.1.0&q=30&auto=format&w=754&h=566&fit=crop&dpr=2 1508w, https://images.theconversation.com/files/469147/original/file-20220616-21-adexyd.jpg?ixlib=rb-1.1.0&q=15&auto=format&w=754&h=566&fit=crop&dpr=3 2262w" alt="" /></a><figcaption>Insulating the walls is crucial to stabilise temperatures inside. Shutterstock</figcaption></figure> Between <a href="https://blog.csiro.au/renovating-or-retrofitting/" target="_blank" rel="noopener">ten and 35%</a> of the energy we spend cooling or heating our homes escapes through single glazed windows and doors. Installing double or triple glazed windows and doors will go a long way to keep temperatures more stable inside. It’s worth noting the <a href="https://build.com.au/window-energy-rating-scheme" target="_blank" rel="noopener">energy performance rating systems</a> on measurement labels, which are often attached to window and door units you can buy in stores. Ultimately, a combination of improved natural ventilation and mechanical ventilation (such as air conditioners as fans) can result in considerable energy savings – <a href="https://thefifthestate.com.au/articles/making-the-building-do-the-work-natural-ventilation-design/" target="_blank" rel="noopener">up to 79%</a> in some instances. 3. Energy consumption While the above strategies will result in significant energy savings, it’s also vital to consider the energy required to produce and manufacture <a href="https://www.pembina.org/pub/embodied-carbon-retrofits" target="_blank" rel="noopener">retrofitting materials</a>. Consider using salvaged or recycled materials where possible, or choosing locally made products which avoid emissions associated with transport. Effectively installing solar panels can offset this “hidden” carbon. Let’s say you’ve done all you can to lower your home’s carbon footprint – you’ve rolled out insulation, installed double glazed windows and made the most of sunshine. You can then calculate the energy you still use to heat or cool your home. This number will determine how many rooftop solar panels you should install to break even, rather than simply installing as many panels that can fit. This will not only save you money, but also minimise waste. Researchers estimate that by 2047, Australia will accumulate <a href="https://theconversation.com/stop-removing-your-solar-panels-early-please-its-creating-a-huge-waste-problem-for-australia-160546" target="_blank" rel="noopener">1 million tonnes</a> of solar panel waste. It’s worth opting for solar panels with micro-inverters, which capture optimal energy performance per panel while allowing you to add more panels in future if needed. <figure class="align-center zoomable"><a href="https://images.theconversation.com/files/469146/original/file-20220616-11210-4f8kun.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=1000&fit=clip"><img src="https://images.theconversation.com/files/469146/original/file-20220616-11210-4f8kun.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=754&fit=clip" sizes="(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px" srcset="https://images.theconversation.com/files/469146/original/file-20220616-11210-4f8kun.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=600&h=400&fit=crop&dpr=1 600w, https://images.theconversation.com/files/469146/original/file-20220616-11210-4f8kun.jpg?ixlib=rb-1.1.0&q=30&auto=format&w=600&h=400&fit=crop&dpr=2 1200w, https://images.theconversation.com/files/469146/original/file-20220616-11210-4f8kun.jpg?ixlib=rb-1.1.0&q=15&auto=format&w=600&h=400&fit=crop&dpr=3 1800w, https://images.theconversation.com/files/469146/original/file-20220616-11210-4f8kun.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=754&h=503&fit=crop&dpr=1 754w, https://images.theconversation.com/files/469146/original/file-20220616-11210-4f8kun.jpg?ixlib=rb-1.1.0&q=30&auto=format&w=754&h=503&fit=crop&dpr=2 1508w, https://images.theconversation.com/files/469146/original/file-20220616-11210-4f8kun.jpg?ixlib=rb-1.1.0&q=15&auto=format&w=754&h=503&fit=crop&dpr=3 2262w" alt="" /></a><figcaption>Solar panels can offset some of the carbon associated with manufacturing the materials you’ve purchased. Shutterstock</figcaption></figure> Another option is to use <a href="https://www.radiantheatingandcooling.com.au/geothermal-or-air-source-heat-pumps/" target="_blank" rel="noopener">air-source heat pumps</a>, which absorb heat from outside and bring it inside (like a reverse air conditioner). These can take the form of mini-split heat pumps for individual rooms, or multi-zone installations. They can sense indoor temperature, and operate at variable speeds and heating or cooling intensity, which means their energy performance is very efficient. My <a href="https://www.intechopen.com/chapters/79914" target="_blank" rel="noopener">research</a> finds well-planned use of such systems can reduce the energy used for heating by 69% and cooling by 38%. It’s well worth the effort These retrofitting ideas might seem expensive, or take too much time. However, they’ll often save you money in the long run as energy prices become increasingly uncertain. You can look to <a href="https://www.everybuildingcounts.com.au/?__hstc=213300875.d01baaf20feef1321eed69f68f6b9ce7.1644286749265.1644286749265.1644286749265.1&__hssc=213300875.1.1644286749266&__hsfp=475898586" target="_blank" rel="noopener">Every Building Counts</a>, an initiative by the <a href="https://new.gbca.org.au/" target="_blank" rel="noopener">Green Building Council</a> and the <a href="https://www.propertycouncil.com.au/" target="_blank" rel="noopener">Property Council of Australia</a>, which provides practical plans for emission reduction. Australia can also learn from ongoing efforts by the <a href="https://energiesprong.org/?country=the-netherlands" target="_blank" rel="noopener">Energiesprong network</a> in the Netherlands. This network is industrialising energy efficiency with <a href="https://energiesprong.org/this-dutch-construction-innovation-shows-its-possible-to-quickly-retrofit-every-building/" target="_blank" rel="noopener">prefabricated retrofitting building elements</a>. Some initiatives include lightweight insulated panels that can simply be placed in front of existing walls of homes. These panels are precisely fitted after carefully laser scanning a facade and robotically cutting openings to match existing homes. Harnessing contemporary technology is vital for a speedy net-zero transition.<img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/175921/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/nimish-biloria-772399" target="_blank" rel="noopener">Nimish Biloria</a>, Associate Professor of Architecture, <a href="https://theconversation.com/institutions/university-of-technology-sydney-936" target="_blank" rel="noopener">University of Technology Sydney</a> This article is republished from <a href="https://theconversation.com" target="_blank" rel="noopener">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/keen-to-retrofit-your-home-to-lower-its-carbon-footprint-and-save-energy-consider-these-3-things-175921" target="_blank" rel="noopener">original article</a>. Image: Getty Images

Home Hints & Tips

Household appliances that use the most energy

As the colder months are well and truly settling in, a lot of us are relying on our various devices and appliances to make winter a little easier. However, as energy bills continue to rise, it’s worth being aware of things in our home that leech more electricity than others and therefore drive our electricity bills even higher. With general household appliances being responsible for more than 30% of your energy consumption, it's reflecting on your daily usage habits of appliances, and making any substitutes where you can. One of the main energy drains in most households are tumble dryers. While they are certainly a convenient purchase, dryers can drastically increase your electricity bill, as regularly using your clothes dryer can cost you anywhere from $100-$650 a year. To cut down the costs of your dryer, only tumble dry your clothes when absolutely necessary, which is admittedly a lot easier said than done in winter. If you can hang out your clothes to dry them, take advantage of this option. Also, make sure you turn off your tumble dryer at the powerpoint when it’s not in use, as some dryers can still use energy even when they’re not being used. Another huge power drain is fridges, as they are in use 24 hours a day. As we can’t go without a fridge, and can’t unplug it when it’s not in use (because it's always in use), it's important to pick the right fridge for your needs. Choosing a smaller fridge can help cut some electricity costs, as bigger units use more power to keep on. Also, look for the energy efficient stickers on fridges when making your purchase and decide accordingly. Air conditioning units and heaters can also contribute to almost 40% of your total energy bill, especially in times of extreme weather. For the sake of your electricity bill, it's best to limit the use of these appliances where you can and stay warm in other ways. Think electric blankets, cups of tea and only the cosiest slippers. And again, looking out for energy efficient stickers on these appliances when you’re buying them will help you save big bucks on your bills. Other smaller appliances such as TVs, computer monitors and even kettles are notorious for passively draining the electricity when they’re not being used. In order to prevent this accumulative energy drain, be sure to switch off these appliances at the powerpoint when you’re not using them, and your next electricity bill will thank you. Image credits: Getty Images

Home Hints & Tips

If you’re renting, chances are your home is cold. With power prices soaring, here’s what you can do to keep warm

If you’re feeling the cold this winter, you’re not alone. About a quarter of all Australians have trouble keeping their homes warm enough in winter. That figure is likely to soar this year, due to poor quality housing and the rapidly escalating energy crisis. Renters are particularly at risk, but our research has shown many home owners are in the same boat as well. We’ve collected data over the last few years on how many Australians have cold homes, find it <a href="https://theconversation.com/forget-heatwaves-our-cold-houses-are-much-more-likely-to-kill-us-83030">difficult to stay warm</a>, and can’t afford their heating bills. What counts as cold? The World Health Organization recommends a <a href="https://www.who.int/publications/i/item/WHO-CED-PHE-18.10">minimum home temperature</a> of 18℃ for health and wellbeing. About a fifth of Australian renters, for example, <a href="https://doi.org/10.1038/s41597-022-01136-5">have cold homes</a>. Our <a href="https://able.adelaide.edu.au/housing-research/research/healthy-housing-cre/cold-in-australian-homes#0">current research</a> has shown this applies to home owners as well, with 26% of people across all housing types unable to stay warm at least half of the time during winter. Australia’s energy crisis is likely to see soaring rates of energy poverty, meaning being unable to keep your home warm or cool enough. Here’s why this is such a problem – and what you can do about it. <h2>Cold homes affect our health</h2> If you’re cold at home, you have a higher risk of developing <a href="https://link.springer.com/article/10.1007/s00484-017-1379-0">respiratory problems</a>and <a href="https://journals.lww.com/jhypertension/fulltext/2014/08000/Stronger_association_of_indoor_temperature_than.8.aspx?casa_token=TFv1eApy3hQAAAAA:9tc6eHiZCAk72mWgrmcgSxQT7kLczUDd7XNpXvNvoIFcMF6pJPSGpORK3SI-Veu4oc994saGXCWuJFBCs3pYN4g">high blood pressure</a>. People in the coldest homes face a higher risk of <a href="https://www.sciencedirect.com/science/article/pii/S0013935114003661?casa_token=vWpvR-oc8iMAAAAA:q72pW312N2oWIm1Gf9jpTTGUr3sH8uM_DankOAVzziVRT8_OPPnPjxJzDIC_x5j4Pr7O_Uuq">dying in winter</a>. Cold can have a flow-on impact on our health system, which is already struggling. Australia’s south-east has had the coldest start to winter <a href="https://thenewdaily.com.au/news/national/2022/06/09/cold-winter-weather-australia/">in decades</a>. Melbourne hasn’t been this cold this early since 1949, while Sydney hasn’t seen these temperatures in early June since 1989. <h2>Double trouble: cold weather and the energy crisis</h2> If you’ve been hit by the recent cold snap, chances are you’ll have been reminded how cold your home can get. This is not a surprise given how badly <a href="https://www.sustainability.vic.gov.au/research-data-and-insights/research/energy-efficiency-and-reducing-emissions/household-retrofit-trials">existing homes</a> and <a href="https://theconversation.com/australias-still-building-4-in-every-5-new-houses-to-no-more-than-the-minimum-energy-standard-118820">new housing</a> perform in keeping an even temperature. The cold has made many people doubly worried, because the energy required to heat our leaky, poorly insulated homes is about to get <a href="https://theconversation.com/expect-more-power-price-hikes-a-1970s-style-energy-shock-is-on-the-cards-183911">very expensive</a>. Early results from <a href="https://able.adelaide.edu.au/housing-research/research/healthy-housing-cre/cold-in-australian-homes#0">our survey</a> of over 350 Australians found 25% of people were experiencing shortages of money to the point they will be unable to adequately heat their homes. One third of our respondents said energy was unaffordable. Some reported making trade-offs, such as skimping on food or healthcare to pay energy bills. These people are experiencing energy poverty, where a household is unable to properly heat or cool their home or face significant financial difficulty doing so. While data about energy poverty in Australia is patchy, we know around 180,000 households <a href="https://vcoss.org.au/wp-content/uploads/2018/11/Persistent-Energy-Hardship-FINAL-Web-Single-Page.pdf">in Victoria</a> had persistent bill payment issues as of 2018, and 45,000 households were consistently unable to heat their homes. <h2>Energy price increases hit lower income households hardest</h2> Lower income households are more at risk from the cold. That’s because they’re more likely to live in homes that are in <a href="https://www.tandfonline.com/doi/full/10.1080/10852352.2016.1197714?casa_token=D_2YbBQ9wRkAAAAA%3A5Z_XqM42cmGunbSwhVJ-EaaHrtV4w3nORhDq9ZoaqAMBx700PldV7_9VVPdAWy7mm2hi3KYLOij3">poor condition</a> and hard to heat. One quarter of low income households told us they struggle to stay warm. Insulation may be a key factor, with 25% of our respondents reporting their rental properties did not have insulation. Insulation matters, because heat escapes homes through <a href="https://www.yourhome.gov.au/passive-design/glazing">single-pane windows</a>, or poorly insulated walls and ceilings. As a result, poorly insulated homes <a href="https://environmentvictoria.org.au/resource/10-tips-warm-house/">cost more to heat</a>. This makes life harder for low income renters, given they have little control over insulation or other home modifications. Worse still, heaters that are cheap to buy are often the most <a href="https://www.climatecouncil.org.au/top-tips-improve-home-energy-efficiency/#:%7E:text=Shoot%20for%20the%20stars%3A%20Top%20tips%20to%20improve%20your%20home's%20energy%20efficiency,-26.11.21%20By&text=Compared%20to%20a%206%2Dstar,amount%20of%20electricity%20we%20use.">expensive to run</a>. While an efficient reverse cycle air conditioner would save money and heat the space better over the longer term, it is often difficult for renters to negotiate installation with property managers or landlords – especially given the intense competition for rentals at present in many cities. That can mean renters will suffer in silence, unwilling to ask for something that will make their lives better. <h2>What can renters do?</h2> Low income renters face real threats from energy poverty this year. While we need systemic change to improve the outlook for Australia’s renters, there are low-cost DIY ways to improve how <a href="https://www.yourhome.gov.au/">your house retains heat</a> this winter. The first step: check your current heating appliances are working efficiently. Many people don’t clean the filters on their reverse cycle air conditioners. This makes them less efficient, and can drive up energy bills. Poorly sealed windows and doors make it hard to stay warm. Using <a href="https://home.howstuffworks.com/home-improvement/heating-and-cooling/insulated-curtains.htm">thermal curtains</a>, and keeping them closed makes a big difference. Putting a piece of plywood or even a scarf between the curtain rail and the wall to make a <a href="https://environmentvictoria.org.au/2011/07/05/take-the-chill-out-of-winter-with-diy-pelmets/">DIY pelmet</a> also helps keep the heat in. If you have single glazed windows, consider <a href="https://renew.org.au/renew-magazine/buyers-guides/window-buyers-guide/">window films</a> as a way to improve performance for a fraction of the cost of double glazed windows. <a href="https://blog.csiro.au/draught-proof-house/">Sealing the cracks</a> around windows, under doors and around the wider home is also important. Silicon or expanding foam can be used for gaps and cracks. Draughts under doors can be stopped with door seals or door snakes. Close the doors to your bathroom, laundry and other rooms not in use to keep the heat where you need it most. Hanging a blanket over a doorway can also be a cheap way to seal off a room and concentrate heat. It’s also worth checking what rebates and concessions your state government or council is offering. These might include energy efficiency improvements or extra help with heating costs. If you’re renting, your home must meet <a href="https://www.energy.vic.gov.au/energy-efficiency/minimum-rental-standards">minimum standards</a>, so make sure you check what you are entitled to as these vary by state. Everyone deserves a warm home. Our health and well-being depend on it. Building new, energy efficient homes is only part of the answer. We also have to make our 10.8 million <a href="https://www.abs.gov.au/statistics/economy/price-indexes-and-inflation/total-value-dwellings/latest-release#:%7E:text=Total%20value%20of%20dwelling%20stock,-Download&text=Range%3A%206400000%20to%2010400000.&text=End%20of%20interactive%20chart.&text=The%20preliminary%20estimate%20of%20the,in%20the%20December%20quarter%202021.">existing dwellings</a> warmer. Image credits: Getty Images This article originally appeared on <a href="https://theconversation.com/if-youre-renting-chances-are-your-home-is-cold-with-power-prices-soaring-heres-what-you-can-do-to-keep-warm-184472" target="_blank" rel="noopener">The Conversation</a>.

Home & Garden

Energy bills are spiking after the Russian invasion. We should have doubled-down on renewables years ago

Russia’s invasion of Ukraine is happening half a planet away from Australia. But the ripple effects are plain to see at every petrol station and, potentially soon, your electricity bill. As a result of the invasion and Western sanctions on Russian exports, energy prices have skyrocketed. If that makes you think nations should have taken steps to secure alternatives to fossil fuels years ago, you’re not alone. As it is, the much higher energy prices are likely to accelerate the exit of coal – and gas – from our energy grids. This should be a wake-up call. It doesn’t matter that Australia is far from the battlefield. Everyone in the world will be affected in some way. <h2>What’s the link between the invasion and Australian energy prices?</h2> You might think Australia’s domestic supply of coal and gas means we’d be immune to price rises. Not so. Due to formal sanctions and informal shunning of Russian exports, oil, coal and gas are now extremely expensive on a global scale. Thermal coal prices have increased five-fold to an unprecedented ~$A500 per tonne. Oil is ~$140 a barrel and up 60% year on year. Natural gas in Europe is around 50% higher than last October, but since the invasion, prices have spiked as high as ~200% higher than 2021 levels. Coal buyers are locking in supply, concerned that Russian sanctions will continue. Russia is the <a href="https://www.spglobal.com/commodity-insights/en/market-insights/latest-news/metals/030722-factbox-russian-metals-industrys-reliance-on-china-set-to-rise-as-sanctions-disrupt-supplies">third largest exporter of coal</a> and its existing customers are now under pressure to find alternative supplies. Russia’s aggression is not just resulting in a major humanitarian and political crisis. It is also causing pain at the bowser for Australian consumers due to the surge in oil pricing and may soon result in higher electricity bills. Australia’s east-coast electricity market is still heavily reliant upon coal. While many coal-fired power stations have existing supply contracts, the much higher global coal price may increase the cost of any extra coal purchases by existing power stations. Not only that, but our gas-fired power stations are facing potential increases in operating costs due to much higher global gas prices. Unfortunately, we may see the result in rising power bills. The price of future contracts for wholesale electricity next year in NSW are now twice what they were a year ago. Assuming this flows through to end-users, prices for residential customers could increase by as much as 10–15%. <h2>So what should Australia do?</h2> While it’s too late to dodge this bullet, we can prepare for future shocks by doubling down on firmed renewables. The faster we move, the less we’ll be hit by the price and reliability risks of coal. Already under pressure from cheaper renewable technologies, coal power station operators now find themselves potentially facing much higher costs in the short-term. There’s no relief for coal in the long term either, with the rapid rise of renewables and other zero-carbon technologies. Not only that, but most of our coal power stations are near the end of their lives, and industry doesn’t want to build new ones. That means coal will become more and more expensive, as the plants become <a href="https://www.aemo.com.au/-/media/files/electricity/nem/planning_and_forecasting/inputs-assumptions-methodologies/2020/aep-elical-assessment-of-ageing-coal-fired-generation-reliability.pdf">increasingly unreliable</a>. Wind and solar technologies are now much cheaper per unit of energy generated and can be integrated with energy storage to provide dispatchable “firmed” energy. The faster we transition to renewables firmed by storage, the better. If we do this, our new grid will also be more reliable. Continuing to rely upon coal is like relying upon a 1970s car to travel from Sydney to Melbourne on the hottest day of the year. State governments around the nation are already embracing this approach, with the New South Wales government moving ahead with plans for 12 gigawatts (GW) of new renewables and storage and the Victorian government announcing plans for 9GW of offshore windfarms. Governments must carefully design policies to avoid guaranteeing profits for private sector players while socialising any losses across taxpayers and energy consumers. In NSW, <a href="https://econpapers.repec.org/article/blaajarec/v_3a66_3ay_3a2022_3ai_3a1_3ap_3a136-163.htm">alternatives</a> are being considered. As European and many other nations scramble to reduce their dependency on Russian coal, oil and gas, Australia now has a once in a generation opportunity to become a leading exporter of new clean energy. We have truly enormous clean energy resources in the form of free sunlight and wind. To export it, we can either run underseas cables to neighbouring countries, or convert cheap renewable power into <a href="https://theconversation.com/green-hydrogen-is-coming-and-these-australian-regions-are-well-placed-to-build-our-new-export-industry-174466">green hydrogen</a> and ship this to the world just as we currently do with LNG. <h2>What else can we expect to see?</h2> Surging fossil fuel prices has supercharged the existing disruption to an already rapidly changing domestic energy industry. In the past month, Origin announced it would abandon coal more rapidly, with the closure of its NSW coal-fired power station, Eraring, in 2025. Meanwhile, AGL has been pursuing a “demerger” with a view to splitting off its coal assets and pursuing new energy technologies. This comes as Australian tech billionaire Mike Cannon-Brookes and Canadian asset fund Brookfield <a href="https://www.abc.net.au/news/2022-03-06/brt-agl-brookfield-bid-rejected/100887042">offered to buy AGL</a> for $8.25 a share, though they were not successful. Their plan was to accelerate the closure of AGL’s coal assets, which would move AGL from the <a href="https://www.greenpeace.org.au/news/new-government-data-reveals-agl-as-australias-biggest-climate-polluter/">highest carbon emitter in Australia</a> to a clean energy company. The age of coal power is ending, and much faster than most of us realise. This crisis should spur us to build a future-proofed fleet of “firmed” and well-distributed renewables with a known cost structure. By doing this, we will protect ourselves from the pain of geopolitically driven fossil fuel prices. And we will have a platform ready if we want to provide clean energy to the world in the form of green hydrogen. We have had decades to make full use of our wealth of renewable energy resources. We haven’t embraced this as fully as we should have. It turns out localised clean energy production is not just necessary to tackle climate change. It will prove a vital resource as we navigate the highly turbulent decade we have found ourselves in. Image credits: Getty Images This article originally appeared on <a href="https://theconversation.com/energy-bills-are-spiking-after-the-russian-invasion-we-should-have-doubled-down-on-renewables-years-ago-179336" target="_blank" rel="noopener">The Conversation</a>.

Home Hints & Tips

Green hydrogen is coming - and these Australian regions are well placed to build our new export industry

You might remember hearing a lot about green hydrogen last year, as global pressure mounted on Australia to take stronger action on climate change ahead of the COP26 Glasgow summit last November. The government predicts green hydrogen exports and domestic use could be worth up to <a href="https://www.minister.industry.gov.au/ministers/taylor/media-releases/strong-potential-future-australia-germany-hydrogen-exports">A$50 billion within 30 years</a>, helping the world achieve deep decarbonisation. But how close are we really to a green hydrogen industry? And which states are best placed to host it? My research shows that as of next year, and based on where the cheapest renewables are, the best places to produce green hydrogen are far north Queensland and Tasmania. As ever more renewable energy pours into our grid, this picture will change. By the end of the decade, the north Queensland coast could become the hydrogen powerhouse. By 2040, dirt-cheap solar should make inland areas across New South Wales, Queensland, Victoria and South Australia the lowest cost producers. <h2>Renewable energy you can store and transport</h2> Why is there so much buzz around green hydrogen? In short, because it offers us a zero emissions way to transport energy. Take cheap renewable energy and use it to split water into hydrogen and oxygen using an electrolyser. Store the hydrogen on trucks, ship it overseas, or send it by pipeline. Then use the hydrogen for transport, manufacturing or electricity production. <a href="https://images.theconversation.com/files/440605/original/file-20220113-19-1sc50s2.png?ixlib=rb-1.1.0&q=45&auto=format&w=1000&fit=clip"><img src="https://images.theconversation.com/files/440605/original/file-20220113-19-1sc50s2.png?ixlib=rb-1.1.0&q=45&auto=format&w=754&fit=clip" alt="Diagram of uses of green hydrogen" /></a> Pathways for the production and use of green hydrogen. Author provided All the technology exists – it’s the cost holding the industry back at present. That’s where Australia and its wealth of cheap renewable energy comes in. Making hydrogen is nothing new – it has a long history of use in fertiliser production and oil refining. But until now, the main source for hydrogen was gas, a fossil fuel. In the last few years, however, there has been a sudden surge of interest and investment in green hydrogen, and new technology pathways have emerged to produce cheap green hydrogen. As global decarbonisation gathers steam, Japan, South Korea and parts of Europe are looking for clean alternatives to replace the role fossil fuels have played in their economies. Australia is exceptionally well placed to deliver these alternatives, with world-beating renewable resources and ports set up for our existing fossil fuel exports, such as coal and LNG. In 2019, we sold almost $64 billion of black coal, with most going to Japan, South Korea, India and China. As these countries decarbonise, the coal industry will shrink. Green hydrogen could be an excellent replacement. <h2>How competitive is Australian hydrogen?</h2> At present, Australia is a long way from producing green hydrogen cheap enough to compete with fossil fuels, given we seem to have no appetite for taxing carbon pollution. Does that mean it’s a non-starter? Hardly. It was only a decade ago sceptics ridiculed solar and wind as too expensive. They’ve gone awfully quiet as renewable prices fell, and fell, and fell – as tracked by the <a href="https://www.irena.org/Statistics/View-Data-by-Topic/Costs/Global-Trends">International Renewable Energy Agency</a>. Now renewables are <a href="https://www.csiro.au/-/media/EF/Files/GenCost2020-21_FinalReport.pdf">cheaper than coal</a>. Battery storage, too, has fallen drastically in price. The same forces are at work on the key technology we need – cheaper electrolysers. By 2040, the CSIRO predicts an 83% fall in electrolyser costs, according to its <a href="https://publications.csiro.au/publications/publication/PIcsiro:EP2021-3374">Gencost 2021-22 report</a>. By contrast, gas-derived hydrogen with carbon capture is predicted to reduce in cost only slightly. That means green hydrogen is likely to capture much of the market for hydrogen from 2030 onwards. <h2>Which states could benefit?</h2> My research with the <a href="https://www.swinburne.edu.au/research/platforms-initiatives/victorian-hydrogen-hub/">Victorian Hydrogen Hub)</a> shows as of next year, the lowest cost location for green hydrogen would be Far North Queensland ($4.1/kg) and Tasmania ($4.4/kg) due to high renewable resources. But this picture will change. By 2030, northern Queensland’s coastal regions could be the Australian hydrogen powerhouse due to a combination of cheap solar and access to ports. Western Australia and the Northern Territory could also have similar advantages, though the modelling for these areas has not yet been done. As solar energy and electrolyser costs continue to fall, new states could enter the green hydrogen economy. In CSIRO’s cost predictions, electricity from solar is predicted to become much cheaper than wind by 2040. This means sunny areas like central and northern Queensland ($1.7/kg) and inland NSW, Victoria and South Australia ($1.8/kg) could be the best locations for green hydrogen production. In making these estimates, I do not consider supply chain and storage infrastructure required to deliver the hydrogen. Transport could account for between $0.05/kg to $0.75/kg depending on distance. Comparing my modelling to price thresholds set out in the <a href="https://www.industry.gov.au/sites/default/files/2019-11/australias-national-hydrogen-strategy.pdf">National Hydrogen Strategy</a> indicates we can produce green hydrogen for trucking at a similar cost to diesel within four years. Fertiliser would take longer, becoming competitive by 2040. <a href="https://images.theconversation.com/files/440388/original/file-20220112-21-1jzafzm.png?ixlib=rb-1.1.0&q=45&auto=format&w=1000&fit=clip"><img src="https://images.theconversation.com/files/440388/original/file-20220112-21-1jzafzm.png?ixlib=rb-1.1.0&q=45&auto=format&w=754&fit=clip" alt="" /></a> The levelised cost of hydrogen at renewable energy zones in Australia for 2023, 2030 and 2040. (source: Steven Percy, Victorian Hydrogen Hub) <h2>Does our dry country have the water resources for green hydrogen?</h2> If we achieved the $50 billion green hydrogen industry the government is aiming for, how much water would it consume? Surprisingly little. It would take only around 4% of the water we used for our crops and pastures in <a href="https://www.abs.gov.au/statistics/industry/agriculture/water-use-australian-farms/latest-release">2019-20</a> to generate an export industry that size – 225,000 megalitres. Much more water than this will be freed up as coal-fired power stations exit the grid. In Queensland and NSW alone, these power stations consume around 158,000 megalitres a year according to a <a href="https://apo.org.au/sites/default/files/resource-files/2020-04/apo-nid303605.pdf">2020 report</a> prepared for the Australian Conservation Foundation. Coal mining in these two states takes an additional 224,000 megalitres. As the cost of renewable energy falls and falls, we will also be able to desalinate seawater along our coasts to produce hydrogen. We estimate this would account for only about 1% of the cost of producing hydrogen, based on Australian Water Association <a href="https://f.hubspotusercontent30.net/hubfs/14568786/Fact%20Sheets/Desalination_Fact_Sheet.pdf">desalination cost estimates</a>. <h2>How can we get there faster?</h2> This decade, we must plan for our new hydrogen economy. Government and industry will need to develop and support new hydrogen infrastructure projects to produce, distribute, use and export hydrogen at scale. We’re already seeing promising signs of progress, as major mining companies <a href="https://www.abc.net.au/news/2021-10-10/qld-palaszczuk-andrew-forrest-hydrogen-gladstone/100527670">move strongly</a> into green hydrogen. Now we need governments across Australia to rapidly get optimal policy and regulations in place to allow the industry to develop and thrive.<img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important; text-shadow: none !important;" src="https://counter.theconversation.com/content/174466/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/steven-percy-611961">Steven Percy</a>, Senior Research Fellow, Victorian Hydrogen Hub, <a href="https://theconversation.com/institutions/swinburne-university-of-technology-767">Swinburne University of Technology</a> This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/green-hydrogen-is-coming-and-these-australian-regions-are-well-placed-to-build-our-new-export-industry-174466">original article</a>. Image: Shutterstock

Domestic Travel

A new approach finds materials that can turn waste heat into electricity

The need to transition to clean energy is apparent, urgent and inescapable. We must limit Earth’s rising temperature to within 1.5 C to avoid the worst effects of climate change — an especially daunting challenge in the face of the steadily increasing global demand for energy. Part of the answer is using energy more efficiently. <a href="https://doi.org/10.1016/j.rser.2015.12.192">More than 72 per cent of all energy produced worldwide is lost in the form of heat</a>. For example, <a href="https://doi.org/10.1007/s11664-011-1580-6">the engine in a car uses only about 30 per cent of the gasoline it burns to move the car</a>. The remainder is dissipated as heat. Recovering even a tiny fraction of that lost energy would have a tremendous impact on climate change. Thermoelectric materials, which convert wasted heat into useful electricity, can help. Until recently, the identification of these materials had been slow. My colleagues and I have used quantum computations — a computer-based modelling approach to predict materials’ properties — to speed up that process and identify more than 500 thermoelectric materials that could convert excess heat to electricity, and help improve energy efficiency. <h2>Making great strides towards broad applications</h2> The transformation of heat into electrical energy by thermoelectric materials is based on the “Seebeck effect.” In 1826, German physicist <a href="https://doi.org/10.1002/andp.18260820302">Thomas Johann Seebeck observed that exposing the ends of joined pieces of dissimilar metals to different temperatures generated a magnetic field</a>, which was later recognized to be caused by an electric current. Shortly after his discovery, <a href="http://dx.doi.org/10.1049/jste-1.1875.0018">metallic thermoelectric generators were fabricated to convert heat from gas burners into an electric current</a>. But, as it turned out, <a href="https://www.electronics-cooling.com/2006/11/the-seebeck-coefficient/">metals exhibit only a low Seebeck effect</a> — they are not very efficient at converting heat into electricity. <a href="https://images.theconversation.com/files/437873/original/file-20211215-19-1nq0m8v.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=1000&fit=clip"><img src="https://images.theconversation.com/files/437873/original/file-20211215-19-1nq0m8v.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=237&fit=clip" alt="A black and white photo of a woman turning a dial on a large table top radio, with a lantern hanging above it." /></a> The kerosene radio was designed for rural areas, and was powered by the kerosene lamp hanging above it. The flame created a temperature difference across metals to generate the electrical current. ('Popular Science', Issue 6, 1956) In 1929, the Russian scientist <a href="https://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/ioffe-abram-fedorovich">Abraham Ioffe</a> revolutionized the field of thermoelectricity. He observed that semiconductors — materials whose ability to conduct electricity falls between that of metals (like copper) and insulators (like glass) — exhibit a significantly higher Seebeck effect than metals, boosting thermoelectric efficiency 40-fold, <a href="https://www.kelk.co.jp/english/useful/netsuden3.html">from 0.1 per cent to four per cent</a>. This discovery led to the development of the first widely used thermoelectric generator, <a href="https://swling.com/blog/2020/05/soviet-era-kerosene-lamp-generator-gives-new-meaning-to-lets-fire-up-the-radio/">the Russian lamp</a> — a kerosene lamp that heated a thermoelectric material to power a radio. <h2>Are we there yet?</h2> Today, thermoelectric applications range from energy generation in <a href="https://www.energy.gov/ne/articles/what-radioisotope-power-system">space probes</a> to <a href="https://www.newair.com/blogs/learn/what-is-thermoelectric-cooling-and-is-it-right-for-you">cooling devices in portable refrigerators</a>. For example, space explorations are powered by radioisotope thermoelectric generators, <a href="https://solarsystem.nasa.gov/missions/cassini/radioisotope-thermoelectric-generator/">converting the heat from naturally decaying plutonium into electricity</a>. In the movie The Martian, for example, a box of plutonium saved the life of the character played by Matt Damon, by keeping him warm on Mars. <iframe width="440" height="260" src="https://www.youtube.com/embed/0CvzBu5sTps?wmode=transparent&start=0" frameborder="0" allowfullscreen=""></iframe> In the 2015 film, The Martian, astronaut Mark Watney (Matt Damon) digs up a buried thermoelectric generator to use the power source as a heater. Despite this vast diversity of applications, wide-scale commercialization of thermoelectric materials is still limited by their low efficiency. What’s holding them back? Two key factors must be considered: the conductive properties of the materials, and their ability to maintain a temperature difference, which makes it possible to generate electricity. The best thermoelectric material would have the electronic properties of semiconductors and the poor heat conduction of glass. But this unique combination of properties is not found in naturally occurring materials. We have to engineer them. <h2>Searching for a needle in a haystack</h2> In the past decade, new strategies to engineer thermoelectric materials have emerged due to an enhanced understanding of their underlying physics. In a <a href="https://doi.org/10.1038/s41563-021-01064-6">recent study in Nature Materials</a>, researchers from Seoul National University, Aachen University and Northwestern University reported they had engineered a material called tin selenide with the highest thermoelectric performance to date, nearly twice that of 20 years ago. But it took them nearly a decade to optimize it. To speed up the discovery process, my colleagues and I have used quantum calculations to search for new thermoelectric candidates with high efficiencies. We searched a database containing thousands of materials to look for those that would have high electronic qualities and low levels of heat conduction, based on their chemical and physical properties. These insights helped us find the best materials to synthesize and test, and calculate their thermoelectric efficiency. We are almost at the point where thermoelectric materials can be widely applied, but first we need to develop much more efficient materials. With so many possibilities and variables, finding the way forward is like searching for a tiny needle in an enormous haystack. Just as a metal detector can zero in on a needle in a haystack, quantum computations can accelerate the discovery of efficient thermoelectric materials. Such calculations can accurately predict electron and heat conduction (including the Seebeck effect) for thousands of materials and <a href="https://doi.org/10.1039/D0MH01112F">unveil the previously hidden and highly complex interactions between those properties</a>, which can influence a material’s efficiency. Large-scale applications will require themoelectric materials that are inexpensive, non-toxic and abundant. Lead and tellurium are found in today’s thermoelectric materials, but their cost and negative environmental impact make them good targets for replacement. Quantum calculations can be applied in a way to search for specific sets of materials using parameters such as scarcity, cost and efficiency. Although those calculations can reveal optimum thermoelectric materials, synthesizing the materials with the desired properties remains a challenge. A multi-institutional effort involving government-run laboratories and universities in the United States, Canada and Europe has revealed more than <a href="https://doi.org/10.1039/C5TC01440A">500 previously unexplored materials</a> with high predicted thermoelectric efficiency. My colleagues and I are currently investigating the thermoelectric performance of those materials in experiments, and have already discovered new sources of high thermoelectric efficiency. Those initial results strongly suggest that further quantum computations can pinpoint the most efficient combinations of materials to make clean energy from wasted heat and the avert the catastrophe that looms over our planet.<img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important; text-shadow: none !important;" src="https://counter.theconversation.com/content/173472/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/jan-hendrik-pohls-1289084">Jan-Hendrik Pöhls</a>, McCall MacBain Postdoctoral Fellow, Department of Chemistry and Chemical Biology, <a href="https://theconversation.com/institutions/mcmaster-university-930">McMaster University</a> This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/a-new-approach-finds-materials-that-can-turn-waste-heat-into-electricity-173472">original article</a>. Image: (NASA/JPL-Caltech/MSSS), CC BY-NC

Home Hints & Tips

Beware the difference between ‘clean’ and ‘green’ hydrogen

<div> <div class="copy"> <a rel="noreferrer noopener" href="https://cosmosmagazine.com/earth/cosmos-briefing-hydrogen-fuel/" target="_blank">Hydrogen</a> is set to be a crucial part of the energy sector by 2030. It combusts and releases energy without making carbon dioxide, meaning it can be used as an emissions-free source of energy – but research from the Australian National University reminds us that it could have an emissions-intensive future as well. The federal government has listed clean hydrogen as a priority in its <a rel="noreferrer noopener" href="https://cosmosmagazine.com/earth/climate/australian-government-sets-a-net-zero-by-2050-emissions-target/" target="_blank">net-zero emissions plan</a>, and various <a rel="noreferrer noopener" href="https://cosmosmagazine.com/technology/energy/the-incoming-hydrogen-boom/" target="_blank">state governments</a> and <a rel="noreferrer noopener" href="https://cosmosmagazine.com/technology/energy/electrolysers-hydrogen-fuel-manufacture-australia/" target="_blank">private entities</a> have invested in clean hydrogen fuel and infrastructure. ‘Clean’ hydrogen does not necessarily mean it’s emissions-free: while ‘green’ hydrogen, made from water with renewable energy, involves no carbon at all, other types of hydrogen can still emit greenhouse gases. “The Australian Government, and quite a few other governments around the world, have used a definition of ‘clean’ hydrogen that includes ‘blue’ and ‘green’ in their hydrogen strategies. And they’ve not really differentiated at all between these two ways of making hydrogen,” explains Dr Fiona Beck, a senior lecturer at ANU. Currently, most industrial hydrogen is made from methane (natural gas) – releasing CO2 in the process. ‘Blue’ hydrogen is hydrogen made from methane, with carbon capture and storage preventing most of the CO2 from getting into the atmosphere. “The true emissions intensity of blue hydrogen has not been very well reported so far,” says Beck. “For example, international hydrogen strategies assume that you can capture up to 90% of emissions from blue hydrogen, but they’re missing out some really critical parts.” Beck is co-author on a recent <a rel="noreferrer noopener" href="https://doi.org/10.1016/j.apenergy.2021.118145" target="_blank">paper</a> in Applied Energy, examining the relative costs and emissions of blue and green hydrogen. The researchers point out that the CO2 produced while making hydrogen from methane is not the only greenhouse gas involved. It also takes energy to capture and store the CO2, for instance – and excess methane is released as well. “Whenever you extract natural gas, you end up with what we call ‘fugitive emissions’. These are methane leaks that happen during the process of extracting the gas, processing the gas, transporting the gas,” says Beck. “It’s really critical that these are accounted for because methane is a really bad greenhouse gas. It’s worse than carbon dioxide.” While blue hydrogen is currently cheaper to make than green hydrogen, the researchers found that this could change as electrolysers – which are used to make green hydrogen – become more mass-produced. “Electrolysis with renewable energy could become cheaper than fossil fuels with CCS,” says co-author Dr Thomas Longden, also at ANU. “CCS is an expensive option for emissions reduction with most estimates for the cost of carbon capture being above $82 per tonne of carbon dioxide. These estimates increase to about $109 per tonne of CO2 for high capture rates,” he adds. “Blue hydrogen is sometimes discussed as a transition between just using natural gas and going fully green. But one of the things that we discuss in the paper is it’s really unclear how long blue hydrogen would be cheaper than green hydrogen,” says Beck. Both the blue and green hydrogen industries are in their nascency. The researchers believe an exclusive focus on green hydrogen will be both more economically sensible, and better for the environment. “It’s just the wrong trajectory,” says Beck. “If you’re going to put a whole lot of money into a new industry, it should be an industry that’s at least compatible with this energy transition. And we don’t believe that blue hydrogen is really compatible with reducing methane and carbon dioxide.” Image credits: Shutterstock</div> <div id="contributors"> This article was originally published on <a rel="noopener" href="https://cosmosmagazine.com/technology/energy/beware-difference-between-clean-and-green-hydrogen/" target="_blank">cosmosmagazine.com</a> and was written by Ellen Phiddian. </div> </div>

Technology

Beware the lure of unethical solar power

<div> <div class="copy"> Solar energy may be the future. But only if it lets go of the past. International NGO the <a rel="noreferrer noopener" href="https://www.weforum.org/agenda/2021/09/to-lead-the-green-energy-future-solar-must-clean-up-its-supply-chains/" target="_blank">World Economic Forum</a> has issued a damning report card on the state of the world’s solar panel manufacturing. It may be experiencing rapid growth. It may be one of the cheapest sources of power. But its climate credentials face intense scrutiny. Forced labour, coal-fuelled production processes and a lack of transparency around the source of crucial components combine, the WEF says, into a cause for concern. “The solar industry is currently grappling with supply chain issues that could significantly impact its future,” the authors, professors Morgan Bazilian and Dustin Mulvaney, write. Much of their concern is concentrated on the production of polysilicon and the drive to make it cheap. Some 45% of global production of this component is sourced from Xinjiang province in China. And much of the labour force used to produce it is supplied by “re-education camps” detaining ethnic Kazakhs and Kyrgyz. On top of that, the remote desert region relies heavily on locally sourced coal for its power supply. “This attracted polysilicon manufacturers to this region of China in the first place because electricity is a major cost in the production process,” the report reads. Read more: <a rel="noreferrer noopener" href="https://cosmosmagazine.com/technology/solar-and-wind-cheapest-energy-source-in-australia/" target="_blank">Solar and wind cheapest energy source in Australia</a> This, they say, undermines any climate and environmental benefits offered by solar panels further down the supply chain. “Solar panels are cheaper to build and install today in many places than alternative sources of electricity like coal and natural gas, translating to lower levels of greenhouse gases and air pollution,” they write. But Professor Alistair Sproul of the ANU’s School of Photovoltaic & Renewable Energy Engineering says photovoltaic power has more than enough wiggle room in its pricing to clean up its act. Much of the price drop in photovoltaic (PV) production in recent years has been driven by advances in technology, particularly crystalline silicon, he says. “Even if the price stayed where it is now or went up a little – PV is very cost-competitive.” Under current life-cycle <a rel="noreferrer noopener" href="https://www.nrel.gov/analysis/life-cycle-assessment.html" target="_blank">calculations</a>, crystalline silicon PV cells produce about 50g of CO2 for every kilowatt-hour of electricity. Black coal, in comparison, comes in at 1000g of CO2 per kWh. “The PV industry is growing each decade or so by a factor of 10 – this next decade is crucial – but as scale increases, costs will come down anyway – and the industry is not reliant on forced labour,” says Sproul. “Low-cost energy is really key here – so that there is a virtuous cycle – that as PV itself becomes cheaper it should be possible to lower the cost of producing PV further by utilising increasing amounts of PV electricity in manufacturing.” Sproul says materials that need coal for processing – especially steel – are all seeking alternatives. “Hydrogen is definitely an avenue worth exploring as an alternative to coal to reduce iron oxide (for steel) and silicon dioxide ( for silicon). [And] all supply chains need to be clear, transparent and free from forced labour.” Image credit: Shutterstock  <img id="cosmos-post-tracker" style="opacity: 0; height: 1px!important; width: 1px!important; border: 0!important; position: absolute!important; z-index: -1!important;" src="https://syndication.cosmosmagazine.com/?id=167605&title=Beware+the+lure+of+unethical+solar+power" alt="" width="1" height="1" />  </div> <div id="contributors"> This article was originally published on <a rel="noopener" href="https://cosmosmagazine.com/technology/energy/beware-the-lure-of-unethical-solar-power/" target="_blank">cosmosmagazine.com</a> and was written by Jamie Seidel. </div> </div>

Technology

5 self-care tips for when you’re low on energy

Self-care has become a hot topic of late, with popular culture giving the impression it’s mostly made up of face masks, massages, and scented candles. But this concept of looking after ourselves goes beyond these activities and can involve doing things to help with managing your mental health, physical health, spirituality, and relationships. And, when we’re exhausted, overwhelmed, or stressed out, taking time out to do these activities can seem daunting. Here are five self-care activities you can do when you feel this way. 1. Make dinnertime easier When we’re exhausted, making a healthy dinner can be more effort than we have energy for, meaning we may resort to junk food or repetitive meals. To combat this, taking the time to prepare meals that you enjoy ahead of time can be one form of self-care. For example, you might buy particular items - such as pre-prepared sauces or other ingredients - so you can recreate your favourite meal with less effort than it might take to do it all from scratch. 2. Take a small, nagging job off your to-do list Do you have a lingering task you keep meaning to do and often think of intrusively at moments when you can’t do it? Though these kinds of tasks might not be important enough to put at the top of our to-do lists, they can become quite draining to think about. As a form of self-care, making a point to tick one of these tasks off your list can help you stop thinking about it and reduce your mental load, especially if you choose to do it over seemingly more important things. Another method to try is the ‘1 minute rule’, where you start a task with the aim of doing it for just one minute. This could be cleaning up a space, making your bed, or any other task. Once the minute is up, you can decide whether you want to keep doing it - which may feel easier now that you’ve started - or you can choose to do something else. 3. Give your senses a break Though this might be the most similar example to the stereotypical self-care activities such as enjoying a bubble bath, relaxing in a low sensory environment can help you wind down. This could involve dimming the lights, putting on some quiet music or a short meditation, or lying quietly and focusing on the length of your breaths. Focusing on breathing and reducing the amount of sensory input around you is used in a variety of settings and can be a grounding technique when things become too much to handle. 4. Take time to stretch When we’re feeling stressed, tension is often held in our bodies without us knowing, leading to additional tiredness or soreness. Yoga, meditation, and relaxation techniques are useful tools we can use to release the tension, but these can feel too onerous when we’re already feeling low in energy. Instead, choosing a few stretches or strengthening exercises can serve as a form of self-care, forcing us to slow down, take some time, and connect with our bodies. 5. Adjust your temperature Altering body temperature, using either heat or cold, is commonly used as a relaxation technique. Since physical and emotional tension are linked, using an ice or heat pack to ease tension in different areas of your body can help soothe emotional tension. For example, using an ice pack to cool off can be one way to unwind after running errands or sitting in the sun watching the kids. Self-care can be quite personal, and finding your own versions which don’t feel too demanding can help you look after yourself when you’re already feeling exhausted, stressed out, or unmotivated.

Mind

Why we start to lose energy as we age and how it affects our mind and body

It’s a question as old as the search for the mythical fountain of youth. And if you’ve found yourself increasingly nodding off in front of the TV or grumbling about not having quite the spring in your step you used to, no doubt you’ve asked it yourself: Why do we lose energy as we age? One undeniable factor is cellular ageing: the gradual and inevitable decline in function and efficiency of every cell in the body as we grow older. How gradual that decline turns out to be will vary from person to person and is influenced by two important factors: genetics and lifestyle. Those fortunate enough to have so-called “good genes” may find they can sail into their advanced years and remain mentally acute and physically active with robust energy levels. While others must rely on healthy choices throughout their lives in order to remain healthy later in life. But just what is occurring inside our cells as we age? Let’s take a look. Cellular function and ageing Cellular ageing – or cellular senescence – is the point at which your body’s cells can no longer divide, replicate and grow. This leads to an inevitable loss of tissue strength and function, as well as a host of other physical and mental changes that we associate with ageing, including slower metabolism, greatly reduced blood flow, poor sleep patterns, loss of bone density and muscle mass, poor digestion and growing mental decline. All of the body’s energy is produced in our cells’ mitochondria – our body’s power generators – where oxygen and food are processed to form the energy molecule adenosine triphosphate (ATP). The gradual dysfunction of the mitochondria over time – ably assisted by environmental and metabolic stresses such as infections, poor diet, sun damage, nervous stress, smoking, pollution and good old-fashioned living – makes our mitochondria less efficient at producing ATP and hence powering our entire bodies, particularly the brain and the heart, which demand so much of our energy reserves. Recent research and current scientific thinking now holds that it may be possible to reverse that mitochondrial damage and help us navigate the ageing process with less fatigue, more energy and a host of other benefits besides. And it all appears to revolve around a little molecule called nicotinamide adenine dinucleotide (NAD). NAD deficiency Present in every cell of the body, NAD is the critical energising coenzyme that enables our mitochondria to produce the ATP that sustains all of our bodily functions. Without it, our bodies would simply cease to work at all. In our teens and 20s, our bodies are overripe with NAD, but when those levels begin to drop – which can be by as much as 50 per cent by the time we reach our late 40s – that’s when the evidence of cellular dysfunction starts to appear. By the time we reach our 50s, NAD levels have typically declined to a point where cellular function and energy is markedly deficient and the aforementioned age-related conditions become increasingly prominent. That’s why scientists today now believe that restoring and increasing NAD levels is the key to extending our years of high energy and good health. Restoring NAD levels In 2004, Dr Charles Brenner PhD, professor of biochemistry and director of the Obesity Initiative at the University of Iowa, made an important breakthrough in the field of NAD metabolism when he discovered an astonishing new use for a rare form of vitamin B3 known as nicotinomide riboside (NR). “I was working on an enzyme that makes NAD in yeast,” Professor Brenner tells Over60. “NAD is a coenzyme that is the central regulator of metabolism in all forms of life. Received wisdom said that there would be no way to make NAD if we knocked out this enzyme, but I found that NR could bypass the known pathways to NAD in yeast – and I found the NR kinase genes that perform the first step in converting NR to NAD in yeast, mice and humans. NR was a known compound, but it was not previously known to be a vitamin for humans until I found this pathway in 2004.” Professor Brenner found that NR raised NAD levels by acting as an NAD precursor, which means that when taken orally, NR converts to NAD and boosts its level within the cells. “NAD is consumed in conditions of metabolic stress,” explains Professor Brenner, “and NR is the most effective NAD precursor to restore healthful NAD levels.” When Professor Brenner himself became the first person in the world to take NR as a supplement in 2014, it then became commercialised for human consumption and branded ‘Tru Niagen’, opening up a whole new world of possibilities for sustainable health for both body and mind. The Tru Niagen effect <a href="http://www.truniagen.co.nz/">Tru Niagen</a> – the branded form of NR – is creating a huge buzz in the health sciences community for being the only form of vitamin B3 that can lift NAD levels in all human cells. As an energy supplement, its properties and effects have been likened not to the instant burst you might get from caffeine or sugar, but rather to the steady background energy your smartphone uses to maintain its most crucial functions. With more and more studies being undertaken to ascertain how broad its benefits may become, Dr Brenner is confident of its role not just in healthful ageing, but in many other associated fields too. “In the last two years we published multiple studies showing that we can protect against heart failure, nerve damage and central brain injury in rodents,” says Dr Brenner. “Human clinical trials are being done for neuroprotection and cardioprotection. “My research shows that NAD is under attack under multiple conditions of metabolic stress – including alcohol, eating too much, time zone disruption, sun and oxygen damage, noise, infection and multiple disease processes. We need NAD to power our bodies, but we also need NAD to deal with all of these common metabolic stresses. When NAD is committed to these defensive processes, less NAD coenzymes are available to convert our fuel into energy and to catalyse all of our bodily functions.” But are there genuine hopes that <a href="http://www.truniagen.co.nz/">Tru Niagen</a> can be the fountain of youth so many of us long for? Dr Brenner is refreshingly blunt on that score. “I don’t make those kinds of claims,” he says. “This is a science-based supplement and we only talk about things we can test. We do think that by improving our resistance to so many types of metabolic stress that we can age better with Tru Niagen.” So, it’s not a case of living longer, but living better. For those of us nodding off in front of the TV, that would count as a tremendous leap forward. For more information about Tru Niagen, visit <a href="http://www.truniagen.co.nz">www.truniagen.co.nz</a>. This is sponsored content brought to you in conjunction with <a href="http://www.truniagen.co.nz/">Tru Niagen</a>.

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5 self-care tips for when you’re low on energy

Why we start to lose energy as we age and how it affects our mind and body