{"id":44574,"date":"2021-08-09T09:00:51","date_gmt":"2021-08-09T08:00:51","guid":{"rendered":"https:\/\/www.climatechangenews.com\/?p=44574"},"modified":"2021-08-10T14:35:04","modified_gmt":"2021-08-10T13:35:04","slug":"five-takeaways-ipccs-2021-climate-science-report","status":"publish","type":"post","link":"https:\/\/www.climatechangenews.com\/2021\/08\/09\/five-takeaways-ipccs-2021-climate-science-report\/","title":{"rendered":"Five takeaways from the IPCC&#8217;s 2021 climate science report"},"content":{"rendered":"<p><strong>The UN\u2019s climate science body has published a major report on the physical changes happening and projected to occur as a result of human activity, from devastating floods to destructive wildfires.\u00a0<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">It is the first scientific review since 2013 when<\/span><span style=\"font-weight: 400;\">\u00a0the Intergovernmental Panel on Climate Change (IPCC) <\/span><a href=\"https:\/\/www.ipcc.ch\/report\/ar5\/wg1\/\"><span style=\"font-weight: 400;\">started its last round of assessment reports<\/span><\/a><span style=\"font-weight: 400;\">, AR5.<\/span><\/p>\n<p>Assessment reports come in groups of three. <span style=\"font-weight: 400;\">This <a href=\"https:\/\/www.ipcc.ch\/report\/ar6\/wg1\/?__cf_chl_jschl_tk__=pmd_57da6acd17246c61d6ed38fe19e8678d8b57c6aa-1628506482-0-gqNtZGzNAeKjcnBszQpi#FullReport\" target=\"_blank\" rel=\"noopener noreferrer\">first one outlines<\/a> the projected impacts of five emissions scenarios, which range from global net negative and net zero to emissions doubling by 2050 and 2100, compared to current levels.<\/span><\/p>\n<p>The second and third reports, due to land in early 2022, will look at how to adapt to these impacts and how to prevent the worst case scenarios.<\/p>\n<p><span style=\"font-weight: 400;\">Here we round up five key messages from this landmark report.<\/span><\/p>\n<hr \/>\n<h3><b>1. <\/b><b>We are set to pass 1.5C warming by 2040<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">The warming of recent decades has not been seen for millennia, is happening rapidly and almost everywhere on earth and has reversed a long-term global cooling trend. We need to go back around 125,000 years to find evidence of warmer global surface temperatures, spanning multiple centuries.<\/span><\/p>\n<p>That leaves an increasingly narrow pathway to stabilising temperatures at 1.5C above pre-industrial levels by the end of the century, the most ambitious goal of the Paris Agreement.<\/p>\n<p><span style=\"font-weight: 400;\">Under all emissions scenarios outlined in the IPCC report, the earth\u2019s surface warming is projected to reach 1.5C or 1.6C in the next two decades.<\/span><\/p>\n<p>The threshold has come closer partly because scientists have incorporated new datasets in their estimate of historic temperature rise, including from the fast-warming Arctic. That adds 0.1C to the estimate of historic warming. High global emissions since the last assessment reports are continuing that trend.<\/p>\n<p>For any chance of meeting the goal seen as essential to the survival of some vulnerable communities and ecosystems, drastic reductions in CO2 would be needed this decade and net zero emissions by 2050.<\/p>\n<hr \/>\n<h3><b>2. Human activity is driving extreme weather<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">While AR5 concluded that <\/span><span style=\"font-weight: 400;\">human influence on the climate system is \u201cclear\u201d,\u00a0 AR6 said there is \u201chigh confidence\u201d that human activities are the main drivers of more frequent or intense heatwaves, glaciers melting, ocean warming and acidification.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cIt is unequivocal that human influence has warmed the atmosphere, ocean and land,\u201d the report concludes.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">There have been <\/span><a href=\"https:\/\/www.climatechangenews.com\/2021\/08\/04\/timeline-science-linking-climate-change-extreme-weather-took-off\/\"><span style=\"font-weight: 400;\">enormous developments in attribution science<\/span><\/a><span style=\"font-weight: 400;\"> since the last IPCC report. With enhanced models, scientists are now able to quantify how much more likely or intense extreme weather events <\/span><span style=\"font-weight: 400;\">were because of climate change.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Recent studies have shown that the <\/span><a href=\"https:\/\/www.worldweatherattribution.org\/wp-content\/uploads\/WWA-Prolonged-heat-Siberia-2020.pdf\"><span style=\"font-weight: 400;\">Siberian heat wave<\/span><\/a><span style=\"font-weight: 400;\"> in 2020 and extreme heat <\/span><a href=\"http:\/\/www.ametsoc.net\/eee\/2016\/ch19.pdf\"><span style=\"font-weight: 400;\">across Asia<\/span><\/a><span style=\"font-weight: 400;\"> in 2016 would never have happened without humans burning fossil fuels.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cThere has been a real push linking extreme events to societal impacts,\u201d said Dann Mitchell, <\/span><span style=\"font-weight: 400;\">professor of climate change at Bristol University, citing a<\/span><span style=\"font-weight: 400;\">\u00a0<\/span><a href=\"https:\/\/iopscience.iop.org\/article\/10.1088\/1748-9326\/11\/7\/074006\"><span style=\"font-weight: 400;\">2016 study<\/span><\/a> <span style=\"font-weight: 400;\">which found that 506 of the 753 fatalities during the Paris heatwave in 2003 could be blamed on climate change.<\/span><\/p>\n<blockquote><p><a href=\"https:\/\/www.climatechangenews.com\/2021\/08\/04\/timeline-science-linking-climate-change-extreme-weather-took-off\/\"><strong>Timeline<\/strong>: How the science linking climate change to extreme weather took off<\/a><\/p><\/blockquote>\n<hr \/>\n<h3><b>3. We know more about regional climate impacts<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Climate models have improved since the last IPCC report, enabling scientists to analyse current and projected <\/span><a href=\"https:\/\/www.cambridge.org\/core\/services\/aop-cambridge-core\/content\/view\/02F477AAABBD220523748C654EBD6F15\/S2059479821000028a.pdf\/10-new-insights-in-climate-science-2020-a-horizon-scan.pdf\"><span style=\"font-weight: 400;\">temperature and hydrological extremes at a regional level<\/span><\/a><span style=\"font-weight: 400;\"> and understand what global climate impacts will look like in different parts of the world.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Modelling shows that the Arctic is warming faster than other regions and that high latitudes in the Northern Hemisphere are projected to warm by two to four times the level of global warming. While warming in the tropics is slower, it is noticeable because temperatures over land near the equator do not vary much year on year in the absence of human influence.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The <\/span><span style=\"font-weight: 400;\">Gulf Stream is very likely to weaken over the century, according to the report. A complete collapse of the Atlantic Ocean current would disrupt regional weather patterns, weakening African and Asian monsoons and strengthening dry spells in Europe, scientists warn.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cThe climate models have improved since the last report, they have higher spatial resolution which allows you to see more regional impacts and they are better at simulating what will happen in the future in specific regions,\u201d Stephen Cornelius, the IPCC lead for WWF, told Climate Home News.<\/span><\/p>\n<blockquote><p><a href=\"https:\/\/www.climatechangenews.com\/subscribe\/\"><b>Want more climate news?\u00a0<\/b>Sign up to get updates straight to your inbox<\/a><\/p><\/blockquote>\n<hr \/>\n<h3><b>4. We are closer to irreversible tipping points\u00a0<\/b><\/h3>\n<div id=\"attachment_44587\" style=\"width: 810px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-44587\" class=\"size-full wp-image-44587\" src=\"https:\/\/www.climatechangenews.com\/files\/2021\/08\/20769799409_5d97751125_c-e1628252980139.jpg\" alt=\"\" width=\"800\" height=\"450\" srcset=\"https:\/\/cdn.climatechangenews.com\/files\/2021\/08\/06132701\/20769799409_5d97751125_c-e1628252980139.jpg 800w, https:\/\/cdn.climatechangenews.com\/files\/2021\/08\/06132701\/20769799409_5d97751125_c-e1628252980139-112x63.jpg 112w, https:\/\/cdn.climatechangenews.com\/files\/2021\/08\/06132701\/20769799409_5d97751125_c-e1628252980139-300x168.jpg 300w, https:\/\/cdn.climatechangenews.com\/files\/2021\/08\/06132701\/20769799409_5d97751125_c-e1628252980139-768x432.jpg 768w, https:\/\/cdn.climatechangenews.com\/files\/2021\/08\/06132701\/20769799409_5d97751125_c-e1628252980139-600x337.jpg 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><p id=\"caption-attachment-44587\" class=\"wp-caption-text\">An aerial view of Greenland&#8217;s melting ice sheets. (Photo: <a href=\"https:\/\/www.flickr.com\/photos\/gsfc\/20769799409\/in\/photolist-MqZqpW-wU9uBV-2ceh7At-xDmDKP-sUY4KV-rXWVz1-rVgXVk-rw3J8o-rfu7CA-qRLXcf-ZJXncT-nFmWD9-2cazriD-RqkNNJ-2caw31c-2dtNzbY-RqpyQ5-2dybwcH-2csjKZo-2cawTiv-2aMFQpw-PN6qxx-PN9b1a-2cb4krH-2aMFBgY-2dyefWr-RqpeGA-2dyewQF-2dtNHi9-RqmwTW-2cb4hqH-2csjo4Q-2cazy9x-2aMDozE-2cazTnn-Rqpjd9-Rqp6su-2dyHn3Z-2cawQPT-2csjXEN-2caBbzr-2aMCDS5-2cax1hv-PN8LN8-PNBkmk-2csjYZw-2cbkWLZ-2aMDYLq-PN9wUV-2dugECf\" target=\"_blank\" rel=\"noopener noreferrer\">NASA\/Goddard\/Maria-Jos\u00e9 Vi\u00f1as\/Flickr<\/a>)<\/p><\/div>\n<p><span style=\"font-weight: 400;\">The report sounds the alarm about the possibility of irreversible changes to the climate, often called tipping points.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For example, forests could start to die as temperatures rise, becoming less able to absorb carbon dioxide, leading to further warming. Or Antarctic ice sheets could become destabilised, leading to rapid sea level rise.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cThe probability of low-likelihood, high impact outcomes increases with higher global warming levels,\u201d the report notes. <\/span><span style=\"font-weight: 400;\">\u201cAbrupt responses and tipping points of the climate system, such as strongly increased Antarctic ice sheet melt and forest dieback, cannot be ruled out.\u201d\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The melting of Antarctic ice sheets could cause <\/span><a href=\"https:\/\/www.nature.com\/articles\/nature17145?TB_iframe=true&amp;width=914.4&amp;height=921.6\"><span style=\"font-weight: 400;\">sea levels to rise more than a metre by 2100<\/span><\/a><span style=\"font-weight: 400;\"> and 15 metres by 2500.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cWe are now observing climate change with our own eyes in ways we did not do so before. Many temperature extremes are outside the bounds of natural variability and triggering extreme events, such as wildfires,\u201d said <\/span><span style=\"font-weight: 400;\">Corinne Le Quere, a climate scientist at the University of East Anglia, at a briefing last month.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The \u201csubstantial increase in risks\u201d was highlighted in <\/span><a href=\"https:\/\/www.nature.com\/articles\/s41586-021-03629-6\"><span style=\"font-weight: 400;\">recent analysis<\/span><\/a><span style=\"font-weight: 400;\"> which showed that parts of the Amazon are now emitting more carbon than they absorb, Emily Shuckburgh, a University of Cambridge climate scientist, said at the briefing. <\/span><\/p>\n<hr \/>\n<h3><b>5. Methane emissions are an important lever<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">For the first time, the IPCC has dedicated an entire <\/span><a href=\"https:\/\/www.epa.gov\/climate-indicators\/climate-change-indicators-atmospheric-concentrations-greenhouse-gases\"><span style=\"font-weight: 400;\">chapter to \u201cshort-lived climate forcers\u201d<\/span><\/a><span style=\"font-weight: 400;\">\u00a0such as aerosols, particulate matter and methane.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Methane levels are now higher than at any point in the past 800,000 years<\/span><span style=\"font-weight: 400;\"> and are well above the safe limits outlined in AR5.\u00a0<\/span><span style=\"font-weight: 400;\">Methane, which is released into the atmosphere from abandoned coal mines, farming and oil and gas operations, has a global warming impact 84 times higher than CO2 over a 20-year period. It is <\/span><span style=\"font-weight: 400;\">responsible for almost <\/span><a href=\"https:\/\/iopscience.iop.org\/article\/10.1088\/1748-9326\/ab9ed2\"><span style=\"font-weight: 400;\">a quarter<\/span><\/a><span style=\"font-weight: 400;\"> of global warming.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ecosystem responses to global warming, such as <\/span><a href=\"https:\/\/www.pnas.org\/content\/115\/15\/3882\"><span style=\"font-weight: 400;\">thawing permafrost<\/span><\/a><span style=\"font-weight: 400;\"> and wildfires, are highly likely to further increase concentrations of methane in the atmosphere.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The authors state that a strong and rapid reduction in methane emissions would not only curb global warming but also improve air quality.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Despite its global warming impact, methane has received far less attention than CO2 and is not included in most countries\u2019 climate pledges.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cA sharp reduction in methane would give you a short-term win, but it has largely been ignored by governments to date, all the focus has been on CO2 net zero targets,\u201d said Richard Black, senior associate at <\/span><span style=\"font-weight: 400;\">the Energy and Climate Intelligence Unit (ECIU).<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"The Intergovernmental Panel on Climate Change has published its first update on the physical science of climate change since 2013. Here are the key messages","protected":false},"author":57,"featured_media":29329,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[159,4234,3859],"tags":[144],"coauthors":[4555],"class_list":["post-44574","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-climate-science","category-ipcc","category-world","tag-ipcc","type-analysis"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Five takeaways from the IPCC&#039;s 2021 climate science report<\/title>\n<meta name=\"description\" content=\"The Intergovernmental Panel on Climate Change has published its first update on the physical science of climate change since 2013. 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