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data-link-name="header : secondary : View all Opinion" data-testid="column-collapse-sublink-Opinion" tabIndex="-1" class="selectableMenuItem dcr-1julzi7">View all Opinion</a></li><li role="none" class="dcr-4hq641"><a href="/profile/editorial" role="menuitem" data-link-name="header : secondary : The Guardian view" data-testid="column-collapse-sublink-The Guardian view" tabIndex="-1" class="selectableMenuItem dcr-1julzi7">The Guardian view</a></li><li role="none" class="dcr-4hq641"><a href="/index/contributors" role="menuitem" data-link-name="header : secondary : Columnists" data-testid="column-collapse-sublink-Columnists" tabIndex="-1" class="selectableMenuItem dcr-1julzi7">Columnists</a></li><li role="none" class="dcr-4hq641"><a href="/tone/cartoons" role="menuitem" data-link-name="header : secondary : Cartoons" data-testid="column-collapse-sublink-Cartoons" tabIndex="-1" class="selectableMenuItem dcr-1julzi7">Cartoons</a></li><li role="none" class="dcr-4hq641"><a 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}) })</script><input type="checkbox" id="Sport-checkbox-input" tabIndex="-1" aria-hidden="true" class="dcr-1acea34"/><label id="Sport-button" aria-label="Toggle Sport" for="Sport-checkbox-input" aria-haspopup="true" aria-controls="sportLinks" tabIndex="-1" role="menuitem" data-testid="column-collapse-Sport" data-link-name="header : secondary : Sport" class="selectableMenuItem dcr-10b2o1s">Sport</label><ul role="menu" id="sportLinks" data-testid="sportLinks" class="dcr-wp8bgr"><li role="none" class="dcr-9ra8aa"><a href="/sport" role="menuitem" data-link-name="header : secondary : View all Sport" data-testid="column-collapse-sublink-Sport" tabIndex="-1" class="selectableMenuItem dcr-1julzi7">View all Sport</a></li><li role="none" class="dcr-4hq641"><a href="/football" role="menuitem" data-link-name="header : secondary : Football" data-testid="column-collapse-sublink-Football" tabIndex="-1" class="selectableMenuItem dcr-1julzi7">Football</a></li><li role="none" class="dcr-4hq641"><a href="/sport/cricket" role="menuitem" data-link-name="header : secondary : Cricket" data-testid="column-collapse-sublink-Cricket" tabIndex="-1" class="selectableMenuItem dcr-1julzi7">Cricket</a></li><li role="none" class="dcr-4hq641"><a href="/sport/rugby-union" role="menuitem" data-link-name="header : secondary : Rugby union" data-testid="column-collapse-sublink-Rugby union" tabIndex="-1" class="selectableMenuItem dcr-1julzi7">Rugby union</a></li><li role="none" class="dcr-4hq641"><a href="/sport/tennis" role="menuitem" data-link-name="header : secondary : Tennis" data-testid="column-collapse-sublink-Tennis" tabIndex="-1" class="selectableMenuItem dcr-1julzi7">Tennis</a></li><li role="none" class="dcr-4hq641"><a href="/sport/cycling" role="menuitem" data-link-name="header : secondary : Cycling" data-testid="column-collapse-sublink-Cycling" tabIndex="-1" class="selectableMenuItem dcr-1julzi7">Cycling</a></li><li role="none" class="dcr-4hq641"><a href="/sport/formulaone" role="menuitem" 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class="dcr-142siv7"><div class="dcr-11c3nx6"><div><video data-media-id="gu-video-562cd3b7e4b07b857cc22af2" class="gu-video" controls="controls" poster="https://static.guim.co.uk/sys-images/Guardian/Pix/audio/video/2015/10/25/1445778355669/BK_1220_crop_640x360.jpg"> <source src="https://cdn.theguardian.tv/mainwebsite/2015/10/25/151025paulboyd_h264_publish.mp4"/><source src="http://multimedia.guardianapis.com/interactivevideos/video.php?octopusid=10548471&format=video/m3u8"/><source src="http://multimedia.guardianapis.com/interactivevideos/video.php?octopusid=10548471&format=video/3gp&maxwidth=700"/><source src="http://multimedia.guardianapis.com/interactivevideos/video.php?octopusid=10548471&format=video/3gp&minwidth=700"/><source src="http://multimedia.guardianapis.com/interactivevideos/video.php?octopusid=10548471&format=video/webm"/> </video></div><figcaption data-spacefinder-role="inline" class="dcr-18hln3u"><span class="dcr-1alawo7"><svg width="36" height="23" viewBox="0 0 36 23"><path d="M3.2 0l-3.2 3.3v16.4l3.3 3.3h18.7v-23h-18.8m30.4 1l-8.6 8v5l8.6 8h2.4v-21h-2.4"></path></svg></span><span class="dcr-1qvd3m6"><a href="http://www.theguardian.com/environment/video/2015/oct/26/keeping-cool-making-us-hot-video-animation-climate-change">How keeping cool is making us hot</a></span> Guardian</figcaption></div></figure></div></div></div><aside style="--grid-area:title;" data-gu-name="title" class="dcr-1fnjjtg"><div class="dcr-10355cg"><div class="dcr-0"><span class="dcr-1v9xu6e"></span><a href="https://www.theguardian.com/environment/climate-crisis" data-component="section" data-link-name="article section" class="content__label__link dcr-qmfkju"><span>Climate crisis</span></a></div></div></aside><div style="--grid-area:border;" data-gu-name="border" class="dcr-1fnjjtg"><div class="dcr-upmzd8"></div></div><div style="--grid-area:headline;" data-gu-name="headline" class="dcr-1fnjjtg"><div class="dcr-14emo0l"><div class="dcr-cohhs3"><div class="dcr-notra3"><div aria-hidden="true" class="dcr-13832xi"><svg width="11" height="11" viewBox="0 0 11 11" fill="currentColor"><path d="M5.4 0C2.4 0 0 2.4 0 5.4s2.4 5.4 5.4 5.4 5.4-2.4 5.4-5.4S8.4 0 5.4 0zm3 6.8H4.7V1.7h.7L6 5.4l2.4.6v.8z"></path></svg> This article is more than <strong>9 years old</strong></div></div><h1 class="dcr-u0152o">World set to use more energy for cooling than heating</h1><div class="dcr-1nvgr5i">This article is more than 9 years old</div></div></div></div><div style="--grid-area:standfirst;" data-gu-name="standfirst" class="dcr-1fnjjtg"><div class=" dcr-4gwv1z"><p>Rising demand for air conditioning and refrigeration threatens to make planet hotter and undermine pledges to rein in emissions <br /></p></div></div><aside style="--grid-area:meta;" data-gu-name="meta" class="dcr-1fnjjtg"><div class="dcr-14emo0l"><div class="dcr-ich95x"><svg xmlns="http://www.w3.org/2000/svg" width="100%" height="13" viewBox="0 0 1300 13" preserveAspectRatio="none" stroke="var(--article-border)" stroke-width="1" aria-hidden="true" focusable="false" class="dcr-194w08h"><line x1="0" x2="1300" y1="0.5" y2="0.5"></line><line x1="0" x2="1300" y1="4.5" y2="4.5"></line><line x1="0" x2="1300" y1="8.5" y2="8.5"></line><line x1="0" x2="1300" y1="12.5" y2="12.5"></line></svg></div></div><div class="dcr-14emo0l"><div class=" dcr-1v9sla6"><div class="dcr-5oiine"><div class="dcr-1kpcv08"><div><address aria-label="Contributor info" data-component="meta-byline" data-link-name="byline"><div class=" dcr-1cfpnlw"><a rel="author" data-link-name="auto tag link" href="https://www.theguardian.com/profile/jonhenley">Jon Henley</a></div></address><details style="--mobile-color:inherit;" class="dcr-1pexjb9"><summary class="dcr-1ybxn6r"><span class="dcr-u0h1qy">Mon 26 Oct 2015 09.04 GMT</span></summary>Last modified on Wed 25 Aug 2021 14.58 BST</details></div></div><div data-print-layout="hide" class="dcr-9dgpdq"><div class=" dcr-16lnb0w"><gu-island name="ShareButton" priority="feature" deferUntil="visible" props="{"pageId":"environment/2015/oct/26/cold-economy-cop21-global-warming-carbon-emissions","webTitle":"World set to use more energy for cooling than heating","format":{"design":0,"display":0,"theme":0},"context":"ArticleMeta"}"><a href="mailto:?subject=World set to use more energy for cooling than heating&body=https://www.theguardian.com/environment/2015/oct/26/cold-economy-cop21-global-warming-carbon-emissions?CMP=share_btn_url" type="button" class="dcr-bao4ku">Share<div class="src-button-space"></div><svg viewBox="-3 -3 30 30" xmlns="http://www.w3.org/2000/svg" aria-hidden="true"><path fill-rule="evenodd" clip-rule="evenodd" d="M19 16c1.675 0 3 1.35 3 3 0 1.675-1.325 3-3 3a2.97 2.97 0 0 1-2.975-3c0-.125 0-.275.025-.375L7.1 14.15a2.9 2.9 0 0 1-2.075.825C3.325 14.975 2 13.65 2 12a3.004 3.004 0 0 1 3.025-3.025c.775 0 1.5.35 2.075.875l8.95-4.475c-.025-.1-.025-.225-.025-.4A2.966 2.966 0 0 1 19 2c1.675 0 3 1.325 3 2.975C22 6.65 20.675 8 19 8c-.8 0-1.475-.325-2.05-.825l-8.975 4.45C8 11.7 8 11.825 8 12s0 .3-.025.375l8.975 4.45c.575-.5 1.25-.825 2.05-.825m0-12.8c-.975 0-1.8.775-1.8 1.775S18.025 6.8 19 6.8c1 0 1.825-.825 1.825-1.825S20 3.2 19 3.2m0 17.6c1 0 1.825-.825 1.825-1.8 0-1-.825-1.8-1.825-1.8-.975 0-1.8.8-1.8 1.8 0 .975.825 1.8 1.8 1.8"></path></svg></a></gu-island></div><div class=" dcr-1csot3r"><div class="dcr-14baf59"><div><gu-island name="CommentCount" priority="feature" deferUntil="idle" props="{"discussionApiUrl":"https://discussion.theguardian.com/discussion-api","shortUrlId":"/p/4da7f"}"></gu-island></div></div></div></div></div></div></div><div class="dcr-fu29fd"><span class="dcr-1lhv23l"><gu-island name="ExpandableMarketingCardWrapper" priority="enhancement" deferUntil="visible" props="{"guardianBaseURL":"https://www.theguardian.com"}"></gu-island></span></div></aside><div style="--grid-area:body;" data-gu-name="body" class="dcr-1upb05m"><span class="dcr-1iz7gbk"><gu-island name="ExpandableMarketingCardWrapper" priority="enhancement" deferUntil="idle" props="{"guardianBaseURL":"https://www.theguardian.com"}"></gu-island></span><div class="dcr-1a4fred"><div id="maincontent" class="dcr-1bwys2b"><div class="article-body-commercial-selector article-body-viewer-selector dcr-1q6n3e0"><p class="dcr-1eu361v">The world faces a looming and potentially calamitous “cold crunch”, with demand for air conditioning and refrigeration growing so fast that it threatens to smash pledges and targets for global warming.</p><p class="dcr-1eu361v">Worldwide power consumption for air conditioning alone is forecast to surge 33-fold by 2100 as developing world incomes rise and urbanisation advances. Already, the US uses as much electricity to keep buildings cool as the whole of Africa uses on everything; China and India are fast catching up. By mid-century people will use more energy for cooling than heating.</p><div id="sign-in-gate"><gu-island name="SignInGateSelector" priority="feature" deferUntil="visible" props="{"contentType":"Article","sectionId":"environment","tags":[{"id":"environment/climate-crisis","type":"Keyword","title":"Climate crisis"},{"id":"science/scienceofclimatechange","type":"Keyword","title":"Climate science"},{"id":"world/world","type":"Keyword","title":"World news"},{"id":"technology/technology","type":"Keyword","title":"Technology"},{"id":"environment/environment","type":"Keyword","title":"Environment"},{"id":"science/science","type":"Keyword","title":"Science"},{"id":"business/business","type":"Keyword","title":"Business"},{"id":"type/article","type":"Type","title":"Article"},{"id":"tone/news","type":"Tone","title":"News"},{"id":"profile/jonhenley","type":"Contributor","title":"Jon 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id="5f28d67f-f2bd-4b32-8740-3d206daffa6b" data-spacefinder-role="richLink" data-spacefinder-type="model.dotcomrendering.pageElements.RichLinkBlockElement" class=" dcr-1your1i"><gu-island name="RichLinkComponent" priority="feature" deferUntil="idle" props="{"richLinkIndex":2,"element":{"_type":"model.dotcomrendering.pageElements.RichLinkBlockElement","prefix":"Related: ","text":"How America became addicted to air conditioning","elementId":"5f28d67f-f2bd-4b32-8740-3d206daffa6b","role":"richLink","url":"http://www.theguardian.com/environment/2015/oct/26/how-america-became-addicted-to-air-conditioning"},"ajaxUrl":"https://api.nextgen.guardianapps.co.uk","format":{"design":0,"display":0,"theme":0}}"><div data-print-layout="hide" data-link-name="rich-link-2 | 2" data-component="rich-link" data-name="placeholder" class="dcr-1kyw41h"><div data-format-theme="5" data-format-design="0" data-format-display="0" class="dcr-gss5ug"><a href="http://www.theguardian.com/environment/2015/oct/26/how-america-became-addicted-to-air-conditioning" class="dcr-1m887w9"><div class="dcr-1lhuo3r"></div><div class="dcr-ut4tvs"><div class="dcr-1h5b6rb"><div class="dcr-1dgt1gs">How America became addicted to air conditioning</div></div><div class="dcr-eurq8n"><svg width="24" height="24" viewBox="0 0 24 24"><g fill-rule="evenodd"><path d="m12 0c-6.627 0-12 5.373-12 12 0 6.627 5.373 12 12 12 6.627 0 12-5.373 12-12 0-6.627-5.373-12-12-12m.21 19l-.637-.668 4.888-6.326h-11.465v-1.01h11.465l-4.888-6.333.637-.668 6.79 7.158v.685l-6.79 7.157" class="rich-link__arrow-icon"></path></g></svg><div class="dcr-fkf7vq">Read more</div></div></div></a></div></div></gu-island></figure><p class="dcr-1eu361v">And since cold is still overwhelmingly produced by burning fossil fuels, emission targets agreed at next month’s international climate summit in Paris risk being blown away as governments and scientists struggle with a cruel climate-change irony: cooling makes the planet hotter.</p><p class="dcr-1eu361v">“Most people tend to think of energy in terms of heat and light and transport,” said Toby Peters, visiting professor of power and the cold economy at the University of Birmingham. “But more and more, it’s going to be about cold. Demand for cold is already huge, it’s growing fast, and we’re meeting it in basically the same way we’ve been doing for a century. Cold is the Cinderella of the energy debate. If we don’t change the way we do it, the consequences are going to be dramatic.”</p><p class="dcr-1eu361v">Artificial cold is <a href="http://www.popularmechanics.com/home/how-to/a7951/a-brief-history-of-air-conditioning-10720229/" data-link-name="in body link">a recent phenomenon</a>: the first domestic air-conditioning unit appeared in 1914, the first home fridges in 1930. As late as 1965, only a third of UK homes had one.</p><figure id="652e529e-b254-42c6-a0be-b42d105f68cc" data-spacefinder-role="supporting" data-spacefinder-type="model.dotcomrendering.pageElements.ImageBlockElement" class=" dcr-a2pvoh"><div id="img-1" class="dcr-1t8m8f2"><picture class="dcr-evn1e9"><source srcSet="https://i.guim.co.uk/img/media/49d3d3a56cc12cbcdf1a3eae8e7cd9f2efe111c4/1154_0_1888_2832/master/1888.jpg?width=380&dpr=2&s=none&crop=none" media="(min-width: 1300px) and (-webkit-min-device-pixel-ratio: 1.25), (min-width: 1300px) and (min-resolution: 120dpi)"/><source srcSet="https://i.guim.co.uk/img/media/49d3d3a56cc12cbcdf1a3eae8e7cd9f2efe111c4/1154_0_1888_2832/master/1888.jpg?width=380&dpr=1&s=none&crop=none" media="(min-width: 1300px)"/><source srcSet="https://i.guim.co.uk/img/media/49d3d3a56cc12cbcdf1a3eae8e7cd9f2efe111c4/1154_0_1888_2832/master/1888.jpg?width=300&dpr=2&s=none&crop=none" media="(min-width: 980px) and (-webkit-min-device-pixel-ratio: 1.25), (min-width: 980px) and (min-resolution: 120dpi)"/><source srcSet="https://i.guim.co.uk/img/media/49d3d3a56cc12cbcdf1a3eae8e7cd9f2efe111c4/1154_0_1888_2832/master/1888.jpg?width=300&dpr=1&s=none&crop=none" media="(min-width: 980px)"/><source srcSet="https://i.guim.co.uk/img/media/49d3d3a56cc12cbcdf1a3eae8e7cd9f2efe111c4/1154_0_1888_2832/master/1888.jpg?width=620&dpr=2&s=none&crop=none" media="(min-width: 660px) and (-webkit-min-device-pixel-ratio: 1.25), (min-width: 660px) and (min-resolution: 120dpi)"/><source srcSet="https://i.guim.co.uk/img/media/49d3d3a56cc12cbcdf1a3eae8e7cd9f2efe111c4/1154_0_1888_2832/master/1888.jpg?width=620&dpr=1&s=none&crop=none" media="(min-width: 660px)"/><source srcSet="https://i.guim.co.uk/img/media/49d3d3a56cc12cbcdf1a3eae8e7cd9f2efe111c4/1154_0_1888_2832/master/1888.jpg?width=605&dpr=2&s=none&crop=none" media="(min-width: 480px) and (-webkit-min-device-pixel-ratio: 1.25), (min-width: 480px) and (min-resolution: 120dpi)"/><source srcSet="https://i.guim.co.uk/img/media/49d3d3a56cc12cbcdf1a3eae8e7cd9f2efe111c4/1154_0_1888_2832/master/1888.jpg?width=605&dpr=1&s=none&crop=none" media="(min-width: 480px)"/><source srcSet="https://i.guim.co.uk/img/media/49d3d3a56cc12cbcdf1a3eae8e7cd9f2efe111c4/1154_0_1888_2832/master/1888.jpg?width=445&dpr=2&s=none&crop=none" media="(min-width: 320px) and (-webkit-min-device-pixel-ratio: 1.25), (min-width: 320px) and (min-resolution: 120dpi)"/><source srcSet="https://i.guim.co.uk/img/media/49d3d3a56cc12cbcdf1a3eae8e7cd9f2efe111c4/1154_0_1888_2832/master/1888.jpg?width=445&dpr=1&s=none&crop=none" media="(min-width: 320px)"/><img alt="Air-conditioning units outside flats in Hong Kong." src="https://i.guim.co.uk/img/media/49d3d3a56cc12cbcdf1a3eae8e7cd9f2efe111c4/1154_0_1888_2832/master/1888.jpg?width=445&dpr=1&s=none&crop=none" width="445" height="667.5" loading="lazy" class="dcr-evn1e9"/></picture><a href="#img-1" data-ignore="global-link-styling" aria-hidden="true" tabIndex="-1" class="open-lightbox dcr-13fd1ms"><button data-element-id="652e529e-b254-42c6-a0be-b42d105f68cc" type="button" aria-haspopup="dialog" class="open-lightbox dcr-1sv232j"><svg viewBox="-3 -3 30 30" xmlns="http://www.w3.org/2000/svg" aria-hidden="true"><path fill-rule="evenodd" clip-rule="evenodd" d="M23 8.75V1.5l-.5-.5h-7.25v1.25l4.5.6L14 8.575 15.4 10l5.75-5.725.6 4.475zm-22 6.5v7.25l.475.5h7.25v-1.25l-4.475-.6 5.725-5.775L8.6 14l-5.775 5.725-.575-4.475z"></path></svg><span class="dcr-194i6pr">View image in fullscreen</span></button></a></div><figcaption data-spacefinder-role="inline" class="dcr-1pvqcrw"><span class="dcr-1inf02i"><svg width="18" height="13" viewBox="0 0 18 13"><path d="M18 3.5v8l-1.5 1.5h-15l-1.5-1.5v-8l1.5-1.5h3.5l2-2h4l2 2h3.5l1.5 1.5zm-9 7.5c1.9 0 3.5-1.6 3.5-3.5s-1.6-3.5-3.5-3.5-3.5 1.6-3.5 3.5 1.6 3.5 3.5 3.5z"></path></svg></span><span class="dcr-1qvd3m6">Air-conditioning units outside flats in Hong Kong.</span> Photograph: Dan Chung/The Guardian</figcaption></figure><p class="dcr-1eu361v">But cold has quietly become a part of 21st-century life, certainly in advanced economies: people expect air conditioning to make homes, offices and cars comfortable (and many cities habitable); most food in the developed world is chilled or frozen; medicines, including vaccines, need refrigeration; industries such as steel, chemicals and plastics depend on cooling; deprived of cold, data centres – and the internet – would collapse in minutes.</p><p class="dcr-1eu361v">“Heat we know, and we talk about it no end,” said Nick Winser, a former head of Britain’s National Grid who chairs the <a href="https://www.gov.uk/government/news/energy-systems-catapult-birmingham-location-for-new-centre" data-link-name="in body link">Energy Systems Catapult</a>, a new UK technology and innovation centre in the energy field. “Cold has become a hugely significant – yet almost unsung – part of our energy footprint. We know the energy landscape is going to be very different in the near future. We need to see cold’s place in it; start thinking of heat and cold as parts of one integrated system.”</p><p class="dcr-1eu361v">Demand for cold is rising exponentially. Driven by a warming planet and a rapidly expanding middle class in the developing economies – and warmer climes – of south and south-east Asia, air conditioning in particular is surging.</p><p class="dcr-1eu361v">As Stan Cox notes in <a href="http://thenewpress.com/books/losing-our-cool" data-link-name="in body link">Losing Our Cool</a>, it took 15 years for the number of air-conditioned homes in the US to grow from 64m to 100m – but 50m new domestic AC units were bought in China in 2010 alone. The proportion of Chinese homes with refrigerators also soared, from 7% in 1995 to 95% in 2007.</p><p class="dcr-1eu361v">But there is a problem. Almost all cold is still produced by what is known as <a href="http://www.alephzero.co.uk/ref/vapcomcyc.htm" data-link-name="in body link">vapour-compression refrigeration</a>, 100-year-old technology that uses refrigerants – fluids, now usually hydrofluorocarbons or HFCs, that absorb and release heat – plus large amounts of electricity.</p><p class="dcr-1eu361v">“It’s a mature industry,” said Graeme Maidment, professor of refrigeration and air conditioning at London South Bank University. “And for years it wasn’t an obvious industry: it hummed along in the background, like an air conditioner, in fact. That’s only changed in the past 15 years or so, because it’s grown so fast and because we’re so much more concerned by energy consumption, carbon emissions, climate change.” <br/></p><figure id="cde6f205-0c9d-4592-8c4a-c7c9b16ee261" data-spacefinder-role="richLink" data-spacefinder-type="model.dotcomrendering.pageElements.RichLinkBlockElement" class=" dcr-1your1i"><gu-island name="RichLinkComponent" priority="feature" deferUntil="idle" props="{"richLinkIndex":13,"element":{"_type":"model.dotcomrendering.pageElements.RichLinkBlockElement","prefix":"Related: ","text":"India's rising demands for cooling make it a hot topic","elementId":"cde6f205-0c9d-4592-8c4a-c7c9b16ee261","role":"richLink","url":"http://www.theguardian.com/world/2015/oct/26/india-rising-demands-cooling-hot-topic"},"ajaxUrl":"https://api.nextgen.guardianapps.co.uk","format":{"design":0,"display":0,"theme":0}}"><div data-print-layout="hide" data-link-name="rich-link-13 | 13" data-component="rich-link" data-name="placeholder" class="dcr-1kyw41h"><div data-format-theme="5" data-format-design="0" data-format-display="0" class="dcr-gss5ug"><a href="http://www.theguardian.com/world/2015/oct/26/india-rising-demands-cooling-hot-topic" class="dcr-1m887w9"><div class="dcr-1lhuo3r"></div><div class="dcr-ut4tvs"><div class="dcr-1h5b6rb"><div class="dcr-1dgt1gs">India's rising demands for cooling make it a hot topic</div></div><div class="dcr-eurq8n"><svg width="24" height="24" viewBox="0 0 24 24"><g fill-rule="evenodd"><path d="m12 0c-6.627 0-12 5.373-12 12 0 6.627 5.373 12 12 12 6.627 0 12-5.373 12-12 0-6.627-5.373-12-12-12m.21 19l-.637-.668 4.888-6.326h-11.465v-1.01h11.465l-4.888-6.333.637-.668 6.79 7.158v.685l-6.79 7.157" class="rich-link__arrow-icon"></path></g></svg><div class="dcr-fkf7vq">Read more</div></div></div></a></div></div></gu-island></figure><p class="dcr-1eu361v">Air conditioning already accounts for about 40% of power use in Mumbai, India. More than half of Saudi Arabia’s peak summer power consumption – generated by burning 1bn barrels of oil a year – also goes on air conditioning. Even in Britain, air conditioning and refrigeration account for almost 20% of total electricity use, Maidment said.</p><p class="dcr-1eu361v">Most projections suggest that figure will rise sharply. Over the next 15 years, <a href="http://www.eusew.eu/component/see_eventview/?view=see_eventdetail&mapType=hlpc&eventid=5394" data-link-name="in body link">according to the EU</a>, the energy used to cool buildings across Europe is likely to increase by 72%, while the energy used for heating them will fall by 30%.</p><p class="dcr-1eu361v">About 87% of US buildings are now air conditioned, and trends in the developing world suggest it is advancing fast down the same route. The <a href="http://www.csmonitor.com/Environment/Energy-Voices/2014/0331/IPCC-global-warming-report-why-air-conditioning-rises-30-fold-by-2100-video" data-link-name="in body link">Intergovernmental Panel on Climate Change estimates</a> that demand for residential air conditioning alone will rise from 300 terawatt hours a year in 2000 to 4,000 in 2050 and 10,000 by 2100.</p><p class="dcr-1eu361v">New sources of demand are expanding fast, too: according to <a href="http://www.computerweekly.com/news/2240164589/Datacentre-power-demand-grew-63-in-2012-Global-datacentre-census" data-link-name="in body link">Computer Weekly</a>, global data centre power consumption quadrupled from 2007 to 2013, and is set to nearly double again over the next 15 years.</p><p class="dcr-1eu361v">Research by the <a href="http://www.unep.org/transport/gfei/autotool/understanding_the_problem/Netherlands%20Environment%20Agency.pdf" data-link-name="in body link">Netherlands Environmental Assessment Agency predicts</a> that by about 2060, the amount of energy used worldwide in cooling will overtake that used in heating. “In the west,” said Richard Williams of Heriot-Watt University, “we’ve traditionally been more concerned with efficiently capturing and reusing heat. The source for cold has mostly been conventional electricity, or diesel. We’ve just been very slow to realise how important cold has become to our lifestyles.”</p><figure id="404735c5-ee3f-4fd6-8e66-0e613500362b" data-spacefinder-role="inline" data-spacefinder-type="model.dotcomrendering.pageElements.ImageBlockElement" class=" dcr-173mewl"><div id="img-2" class="dcr-1t8m8f2"><picture class="dcr-evn1e9"><source srcSet="https://i.guim.co.uk/img/media/a0c1e932a17415b44788a5df518270986bfbeaf8/0_290_5760_3456/master/5760.jpg?width=620&dpr=2&s=none&crop=none" media="(min-width: 660px) and (-webkit-min-device-pixel-ratio: 1.25), (min-width: 660px) and (min-resolution: 120dpi)"/><source srcSet="https://i.guim.co.uk/img/media/a0c1e932a17415b44788a5df518270986bfbeaf8/0_290_5760_3456/master/5760.jpg?width=620&dpr=1&s=none&crop=none" media="(min-width: 660px)"/><source srcSet="https://i.guim.co.uk/img/media/a0c1e932a17415b44788a5df518270986bfbeaf8/0_290_5760_3456/master/5760.jpg?width=605&dpr=2&s=none&crop=none" media="(min-width: 480px) and (-webkit-min-device-pixel-ratio: 1.25), (min-width: 480px) and (min-resolution: 120dpi)"/><source srcSet="https://i.guim.co.uk/img/media/a0c1e932a17415b44788a5df518270986bfbeaf8/0_290_5760_3456/master/5760.jpg?width=605&dpr=1&s=none&crop=none" media="(min-width: 480px)"/><source srcSet="https://i.guim.co.uk/img/media/a0c1e932a17415b44788a5df518270986bfbeaf8/0_290_5760_3456/master/5760.jpg?width=445&dpr=2&s=none&crop=none" media="(min-width: 320px) and (-webkit-min-device-pixel-ratio: 1.25), (min-width: 320px) and (min-resolution: 120dpi)"/><source srcSet="https://i.guim.co.uk/img/media/a0c1e932a17415b44788a5df518270986bfbeaf8/0_290_5760_3456/master/5760.jpg?width=445&dpr=1&s=none&crop=none" media="(min-width: 320px)"/><img alt="The Facebook data centre in northern Sweden." src="https://i.guim.co.uk/img/media/a0c1e932a17415b44788a5df518270986bfbeaf8/0_290_5760_3456/master/5760.jpg?width=445&dpr=1&s=none&crop=none" width="445" height="267" loading="lazy" class="dcr-evn1e9"/></picture><a href="#img-2" data-ignore="global-link-styling" aria-hidden="true" tabIndex="-1" class="open-lightbox dcr-13fd1ms"><button data-element-id="404735c5-ee3f-4fd6-8e66-0e613500362b" type="button" aria-haspopup="dialog" class="open-lightbox dcr-4tmywn"><svg viewBox="-3 -3 30 30" xmlns="http://www.w3.org/2000/svg" aria-hidden="true"><path fill-rule="evenodd" clip-rule="evenodd" d="M23 8.75V1.5l-.5-.5h-7.25v1.25l4.5.6L14 8.575 15.4 10l5.75-5.725.6 4.475zm-22 6.5v7.25l.475.5h7.25v-1.25l-4.475-.6 5.725-5.775L8.6 14l-5.775 5.725-.575-4.475z"></path></svg><span class="dcr-194i6pr">View image in fullscreen</span></button></a></div><figcaption data-spacefinder-role="inline" class="dcr-1fujct4"><span class="dcr-1inf02i"><svg width="18" height="13" viewBox="0 0 18 13"><path d="M18 3.5v8l-1.5 1.5h-15l-1.5-1.5v-8l1.5-1.5h3.5l2-2h4l2 2h3.5l1.5 1.5zm-9 7.5c1.9 0 3.5-1.6 3.5-3.5s-1.6-3.5-3.5-3.5-3.5 1.6-3.5 3.5 1.6 3.5 3.5 3.5z"></path></svg></span><span class="dcr-1qvd3m6">The Facebook data centre in northern Sweden.</span> Photograph: David Levene/The Guardian</figcaption></figure><p class="dcr-1eu361v">But air conditioning and refrigeration are doubly polluting: not only are they produced from climate-warming fossil fuels, but the HFCs and other refrigerants cooling systems use produce greenhouse gases that can be <a href="http://e360.yale.edu/feature/cooling_a_warming_planet_a_global_air_conditioning_surge/2550/" data-link-name="in body link">up to 4,000 times more potent than carbon dioxide</a>.</p><p class="dcr-1eu361v">If fossil fuel-generated energy still accounts for about 75% of all cooling emissions, these refrigerant leaks could cumulatively increase the warming effect of manmade CO<sub class="dcr-1eu361v">2</sub> emissions by up to 25% by the middle of the century, according to the National Institute for Public Health and the Environment in the Netherlands. Altogether, Maidment said, refrigerant leaks and energy use in cooling account for “around 10% of global CO<sub class="dcr-1eu361v">2</sub> emissions. Already.”</p><p class="dcr-1eu361v">Some refrigeration units are far more harmful. According to a <a href="http://www.carbontrust.com/media/619349/the-emerging-cold-economy.pdf" data-link-name="in body link">report by the energy consultancy E4tech</a>, the small diesel-powered fridges on food trailers emit nearly 30 times more harmful particulate matter and six times more nitrogen oxides than the engine that powers the trucks.<br/></p><p class="dcr-1eu361v">That matters, because the world needs an awful lot more refrigerated food trailers. With the world’s population <a href="https://www.theguardian.com/sustainable-business/feeding-world-nine-billion-population" data-link-name="in body link">forecast to reach 9 billion by 2050</a>, cold’s role in food security will be key. According to the UN <a href="http://www.fao.org/fileadmin/templates/wsfs/docs/expert_paper/How_to_Feed_the_World_in_2050.pdf" data-link-name="in body link">Food and Agriculture Organisation</a>, global food demand is set to grow by 50% in that time.</p><p class="dcr-1eu361v">But the FAO also reckons as much as a third of all food is lost or wasted between harvest and home, mostly in the developing world. Halving food waste would feed 800 million of the 1 billion chronically undernourished people in the world, research by the International Institute of Refrigeration suggests.</p><p class="dcr-1eu361v">“What’s remarkable,” said Peters, “is that 95% of agricultural research is about increasing yields.” Reducing waste should be a priority, he said, and “cold really is the key. But cold done smartly. If we just replicate the old technologies, we’re heading for environmental disaster.”</p><p class="dcr-1eu361v">What is cold done properly? For Maidment, who laments the fact that less than 0.2% of UK engineering research is devoted to cold technologies, it is about “reducing the need for cooling by – for example – designing buildings better. It’s increasing the efficiency of the cooling process. And then making sure the energy you do use is as clean as possible.”</p><p class="dcr-1eu361v">Winser sees “real opportunities for British businesses in all this”. Peters, who co-authored a report on the cold economy to be published by the <a href="http://www.birmingham.ac.uk/research/activity/energy/policy/cold/cold-energy.aspx" data-link-name="in body link">Birmingham University policy commission</a> on 28 October, said we must “completely rethink cold. We need cooling, and we need it globally. Is sucking electricity off the grid really the best way to provide it?”</p><p class="dcr-1eu361v">What if, he suggested, you could use cheap, off-peak renewable energy – wind, say – to make ice at night, and use that for cooling during the day? What about district cooling systems? “Storage,” he said, “will be critical: we store heat, why aren’t we storing cold? And new materials, to move cold around.”</p><p class="dcr-1eu361v">Cold is also wasted. Peters pointed to liquefied natural gas, or LNG. “That’s gas cooled to about –160C to be transported, then ‘unpacked’,” Peters said. “At present, all that cold gets dumped in the sea. And meanwhile, just up the road, someone’s burning diesel to create cold.”</p><p class="dcr-1eu361v">Waste LNG cold could also be used to power clean cold technologies: Dearman, a small UK engineering company with which Peters is involved, is road-testing a <a href="https://www.theguardian.com/sustainable-business/sustainability-case-studies-dearman-engine-liquid-air" data-link-name="in body link">zero-emission, cold-producing engine</a> that runs on liquid nitrogen and could replace the diesel refrigeration unit in a food trailer.</p><p class="dcr-1eu361v">“We just need to think about cold differently,” said Peters. “Because solving cold, really doing it smarter, would actually do more to help the world meet its climate-change targets than almost anything else I can think of.”</p></div></div><gu-island name="SlotBodyEnd" priority="feature" deferUntil="visible" 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