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Almost all of us are going to be worse off as climate change takes hold, whether through heatwaves, changing rainfall patterns, sea level rise, or damage to ecosystems. But it\u2019s the world\u2019s poorest people who will suffer the biggest disruptions to their local climate, as our new study, published in Geophysical Research Letters today, explains.<\/span><\/p>\n The Paris Agreement aims to keep global warming well below 2\u2103 above pre-industrial levels, and ideally no more than 1.5\u2103. Meeting the more ambitious 1.5\u2103 target will be extremely challenging, given that we have already had more than 1\u2103 of global warming so far, and global greenhouse emissions are still rising.<\/span><\/p>\n We examined the likely consequences of missing the 1.5\u2103 global warming target in terms of perceptible local climate change, by looking at the \u201csignal-to-noise ratio\u201d. The idea is that 1\u2103 of warming is more noticeable where there is very little variation in temperature (such as in Singapore, for example) compared with places where the temperature variations are much higher (like Melbourne). Where temperature variations are smaller less warming is needed before the change in climate becomes noticeable.<\/span><\/p>\n Society and ecosystems are adapted to the range of temperatures experienced in their location, so the signal-to-noise measure of climate change reflects this effect. In simple terms, it is a measure of how soon global warming will push the temperature beyond the normal bounds of variation at a given location. This will happen sooner in places where the weather doesn\u2019t vary much, and later in places where it does.<\/span><\/p>\n Because global warming is likely to overshoot the ambitious Paris goal of 1.5\u2103, but perhaps not the more modest 2\u2103 goal, we looked in particular at the signal-to-noise ratio created by using state-of-the-art global climate model projections to move between 1.5\u2103 and 2\u2103 of global warming.<\/span><\/p>\n As expected, the signal-to-noise ratio is high in the tropics, where the variability in temperature is lower. This means that local temperature changes due to global warming will generally be felt more keenly in the tropics than at higher latitudes if the world exceeds the 1.5\u2103 Paris target.<\/span><\/p>\n The inequality of climate change<\/strong><\/span><\/p>\n Next, we overlaid the signal-to-noise ratio data with population and gross domestic product (GDP) data to investigate the relationship between local climate change and wealth.<\/span><\/p>\n As the less economically developed areas of the world are predominantly in the tropics, and the more developed economies are at higher latitudes, we predict that the world\u2019s wealthiest countries will experience less perceptible climate change than the poorest.<\/span><\/p>\n For example, we project that the people of the UK, the first country to industrialise and one of the world\u2019s richest nations, would experience less than half the level of perceptible climate change, as measured by our signal-to-noise ratio, than the people of the Democratic Republic of Congo, one of the world\u2019s poorest.<\/span><\/p>\n This means that if we do exceed the 1.5\u2103 Paris target, the countries that will face the biggest impact are those who are least to blame for creating the problem, and least equipped to deal with the resulting problems.<\/span><\/p>\n An impetus to act<\/strong><\/span><\/p>\n Keeping global warming to modest levels, as signatories to the Paris Agreement have pledged to do, has many benefits compared with the alternative of a 3\u2103 or 4\u2103 warmer world. Previous research has shown that this would reduce the frequency of heat extremes and their impacts in many places around the world, and would reduce droughts and extreme rain events. There would be benefits for many of the world\u2019s plant and animal species as well as entire ecosystems, including the Great Barrier Reef.<\/span><\/p>\n Limiting global warming also helps the poorest parts of the world develop. By reducing greenhouse gas emissions more rapidly the developed world would put less of the burden of climate change onto the developing world. This should incentivise stronger emissions reductions globally. The UN Sustainable Development Goals call for action to eradicate absolute poverty and reduce inequality. Our research underlines the fact that both of these goals, and others, depend implicitly on reining in global warming.<\/span><\/p>\n Unfortunately, the alternative \u2013 and where our current emissions trajectory is taking us \u2013 is a warmer world in which the poorest and least culpable nations pay the biggest price.<\/span><\/p>\n <\/p>\n * Published in print edition on 1 June 2018<\/em><\/span><\/p>\n","protected":false},"excerpt":{"rendered":" Global warming will be most noticeable where the weather doesn’t normally vary much, such as the tropics. But these places are also home to many of the world’s poorest and least culpable nations Almost all of us are going to be worse off as climate change takes hold, whether through heatwaves, changing rainfall patterns, sea […]<\/p>\n","protected":false},"author":1,"featured_media":13893,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[8348],"tags":[10715,1360,10714,1359,10716],"class_list":["post-13886","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-the-conversation","tag-an-impetus","tag-climate-change","tag-global-warming-goal","tag-paris-agreement","tag-un-sustainable-development-goals"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.mauritiustimes.com\/mt\/wp-content\/uploads\/2018\/06\/Environment.gif?fit=300%2C168&ssl=1","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p8QzSF-3BY","_links":{"self":[{"href":"https:\/\/www.mauritiustimes.com\/mt\/wp-json\/wp\/v2\/posts\/13886","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mauritiustimes.com\/mt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.mauritiustimes.com\/mt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.mauritiustimes.com\/mt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mauritiustimes.com\/mt\/wp-json\/wp\/v2\/comments?post=13886"}],"version-history":[{"count":0,"href":"https:\/\/www.mauritiustimes.com\/mt\/wp-json\/wp\/v2\/posts\/13886\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.mauritiustimes.com\/mt\/wp-json\/wp\/v2\/media\/13893"}],"wp:attachment":[{"href":"https:\/\/www.mauritiustimes.com\/mt\/wp-json\/wp\/v2\/media?parent=13886"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.mauritiustimes.com\/mt\/wp-json\/wp\/v2\/categories?post=13886"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.mauritiustimes.com\/mt\/wp-json\/wp\/v2\/tags?post=13886"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Andrew King<\/strong><\/span>
\nClimate Extremes Research Fellow, University of Melbourne<\/span><\/h5>\nLuke Harrington<\/strong><\/span>
\nPostdoctoral Research Assistant, Environmental Change Institute, University of Oxford<\/span><\/h5>\n
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