{"id":10179,"date":"2021-08-09T10:56:59","date_gmt":"2021-08-09T08:56:59","guid":{"rendered":"https:\/\/www.culturalusa.com\/news\/?p=10179"},"modified":"2021-08-09T10:58:39","modified_gmt":"2021-08-09T08:58:39","slug":"alerte-rouge-pour-lhumanite-le-rechauffement-climatique-saccelere","status":"publish","type":"post","link":"https:\/\/www.culturalusa.com\/news\/technologie\/alerte-rouge-pour-lhumanite-le-rechauffement-climatique-saccelere\/","title":{"rendered":"Alerte rouge pour l&rsquo;humanit\u00e9, le r\u00e9chauffement climatique s&rsquo;acc\u00e9l\u00e8re"},"content":{"rendered":"<p>Le r\u00e9chauffement de la plan\u00e8te pourrait atteindre le seuil de +1,5\u00b0C autour de 2030, dix ans plus t\u00f4t qu&rsquo;estim\u00e9, mena\u00e7ant de nouveaux d\u00e9sastres \u00ab\u00a0sans pr\u00e9c\u00e9dent\u00a0\u00bb l&rsquo;humanit\u00e9, d\u00e9j\u00e0 frapp\u00e9e par des canicules et inondations en s\u00e9rie.<\/p>\n<h3>Pire et plus vite qu&rsquo;on le craignait.<\/h3>\n<blockquote><p>A moins de trois mois de la conf\u00e9rence climat COP26 \u00e0 Glasgow, le constat choc des experts climat de l&rsquo;ONU (Giec) publi\u00e9 lundi, sonne comme un branle-bas de combat : les humains sont \u00ab\u00a0indiscutablement\u00a0\u00bb responsables des d\u00e9r\u00e8glements climatiques et n&rsquo;ont d&rsquo;autre choix que de r\u00e9duire drastiquement les \u00e9missions de gaz \u00e0 effet de serre, s&rsquo;ils veulent en limiter les d\u00e9g\u00e2ts.<\/p><\/blockquote>\n<p>Ce premier rapport d&rsquo;\u00e9valuation depuis sept ans, adopt\u00e9 vendredi par 195 pays, passe en revue cinq sc\u00e9narios d&rsquo;<strong>\u00e9missions de gaz \u00e0 effet de serre<\/strong>, du plus optimiste &#8211; certains diraient utopiste &#8211; \u00e0 l&rsquo;hypoth\u00e8se du pire.<\/p>\n<p>Dans tous les cas, la plan\u00e8te devrait atteindre le seuil de +1,5\u00b0C par rapport \u00e0 l&rsquo;\u00e8re pr\u00e9-industrielle autour de 2030. Dix ans plus t\u00f4t que la pr\u00e9c\u00e9dente estimation du Giec en 2018.<\/p>\n<p>Ensuite, d&rsquo;ici 2050, la hausse se poursuivrait bien au-del\u00e0 de ce seuil &#8211; qui est une des limites-cl\u00e9s de l&rsquo;Accord de Paris &#8211; m\u00eame si le monde parvenait \u00e0 r\u00e9duire fortement les \u00e9missions de gaz \u00e0 effet de serre.<\/p>\n<p>Et si ces \u00e9missions ne sont pas drastiquement r\u00e9duites, les +2\u00b0C seront d\u00e9pass\u00e9s au cours du si\u00e8cle. Ce qui signerait l&rsquo;\u00e9chec de l&rsquo;Accord de Paris et son objectif de limiter le r\u00e9chauffement \u00ab\u00a0bien en-de\u00e7\u00e0\u00a0\u00bb de +2\u00b0C, si possible +1,5\u00b0C.<\/p>\n<h3>\u00ab\u00a0Ce n&rsquo;est que la premi\u00e8re salve\u00a0\u00bb<\/h3>\n<p>Alors que la plan\u00e8te a gagn\u00e9 pour l&rsquo;instant +1,1\u00b0C, le monde voit de ses propres yeux les cons\u00e9quences d\u00e9j\u00e0 \u00e0 l&rsquo;oeuvre. Encore plus cet \u00e9t\u00e9, avec les images de flammes ravageant l&rsquo;Ouest am\u00e9ricain, la Gr\u00e8ce ou la Turquie, des flots submergeant des r\u00e9gions d&rsquo;Allemagne ou de Chine, ou un thermom\u00e8tre qui fr\u00f4le les 50\u00b0C au Canada.<\/p>\n<blockquote><p>\u00ab\u00a0Si vous pensez que \u00e7a, c&rsquo;est grave, rappelez-vous que ce que nous voyons aujourd&rsquo;hui n&rsquo;est que la premi\u00e8re salve\u00a0\u00bb, commente Kristina Dahl, de l&rsquo;organisation Union for Concerned Scientists.<\/p><\/blockquote>\n<p>M\u00eame \u00e0 +1,5\u00b0C, les canicules, inondations et autres \u00e9v\u00e9nements extr\u00eames vont augmenter de mani\u00e8re \u00ab\u00a0sans pr\u00e9c\u00e9dent\u00a0\u00bb en termes d&rsquo;ampleur, de fr\u00e9quence, d&rsquo;\u00e9poque de l&rsquo;ann\u00e9e o\u00f9 elles frapperont et de zones touch\u00e9es, pr\u00e9vient le Giec.<\/p>\n<p>\u00ab\u00a0Ce rapport devrait faire froid dans le dos \u00e0 quiconque le lit (&#8230;) Il montre o\u00f9 nous en sommes et o\u00f9 nous allons avec le changement climatique : dans un trou qu&rsquo;on continue de creuser\u00a0\u00bb, a comment\u00e9 le climatologue Dave Reay.<\/p>\n<h3>Face \u00e0 cet avenir apocalyptique, les appels \u00e0 agir se multiplient.<\/h3>\n<p>\u00ab\u00a0Stabiliser le climat va n\u00e9cessiter une r\u00e9duction forte, rapide, et durable des \u00e9missions de gaz \u00e0 effet de serre, pour atteindre la neutralit\u00e9 carbone\u00a0\u00bb, insiste Panmao Zhai, co-pr\u00e9sident du groupe d&rsquo;experts ayant \u00e9labor\u00e9 ce premier volet de l&rsquo;\u00e9valuation du Giec.<\/p>\n<p>Le deuxi\u00e8me volet sur les impacts, pr\u00e9vu pour f\u00e9vrier 2022, montre en d\u00e9tails comment la vie sur Terre sera in\u00e9luctablement transform\u00e9e d&rsquo;ici 30 ans, voire plus t\u00f4t, selon une version pr\u00e9liminaire obtenue par l&rsquo;AFP.<\/p>\n<p>Le troisi\u00e8me volet sur les solutions est attendu en mars. Mais la voie \u00e0 suivre est d\u00e9j\u00e0 largement connue pour mettre en place la transition vers une \u00e9conomie d\u00e9carbon\u00e9e.<\/p>\n<p>\u00ab\u00a0Ce rapport doit sonner le glas du charbon et des \u00e9nergies fossiles avant qu&rsquo;ils ne d\u00e9truisent notre plan\u00e8te\u00a0\u00bb, a ainsi plaid\u00e9 le secr\u00e9taire g\u00e9n\u00e9ral de l&rsquo;ONU Antonio Guterres, accusant ces \u00e9nergies et la d\u00e9forestation \u00ab\u00a0d&rsquo;\u00e9touffer la plan\u00e8te\u00a0\u00bb.<\/p>\n<h3>Vers +4\u00b0 ou +5\u00b0 au rythme actuel<\/h3>\n<p>Alors qu&rsquo;il faudrait r\u00e9duire les \u00e9missions de CO2 de moiti\u00e9 d&rsquo;ici 2030 pour tenir le +1,5\u00b0C, tous les regards se tournent d\u00e9sormais vers Glasgow o\u00f9 se r\u00e9uniront en novembre les dirigeants du monde entier.<\/p>\n<p>\u00ab\u00a0Il n&rsquo;y a pas le temps d&rsquo;attendre et pas de place pour les excuses\u00a0\u00bb, a insist\u00e9 Antonio Guterres, r\u00e9clamant que la COP soit un \u00ab\u00a0succ\u00e8s\u00a0\u00bb, apr\u00e8s cette \u00ab\u00a0alerte rouge pour l&rsquo;humanit\u00e9\u00a0\u00bb lanc\u00e9e par le Giec.<\/p>\n<p>Mais \u00e0 ce stade, seule la moiti\u00e9 des gouvernements ont r\u00e9vis\u00e9 leurs engagements d&rsquo;\u00e9missions de gaz \u00e0 effet de serre. La pr\u00e9c\u00e9dente s\u00e9rie d&rsquo;engagements, pris dans la foul\u00e9e de l&rsquo;Accord de Paris de 2015, conduirait \u00e0 un monde \u00e0 +3\u00b0C, s&rsquo;ils \u00e9taient respect\u00e9s, mais au rythme actuel, le monde se dirige plut\u00f4t vers +4\u00b0C ou +5\u00b0C.<\/p>\n<p>Au milieu de ses sombres projections, le Giec apporte malgr\u00e9 tout un espoir auquel se raccrocher.<\/p>\n<p>Dans le meilleur sc\u00e9nario, la temp\u00e9rature pourrait revenir sous le seuil de 1,5\u00b0C d&rsquo;ici la fin du si\u00e8cle, en coupant drastiquement les \u00e9missions et en aborbant plus de CO2 qu&rsquo;on en \u00e9met. Mais les techniques permettant de r\u00e9cup\u00e9rer le CO2 dans l&rsquo;atmosph\u00e8re \u00e0 large \u00e9chelle sont toujours \u00e0 l&rsquo;\u00e9tat de recherche, note le Giec.<\/p>\n<h3>Cons\u00e9quences irr\u00e9versibles<\/h3>\n<p>Et certaines cons\u00e9quences du r\u00e9chauffement sont de toute fa\u00e7on \u00ab\u00a0irr\u00e9versibles\u00a0\u00bb, insiste le rapport. Sous l&rsquo;influence de la fonte des glaces polaires, le niveau des oc\u00e9ans va continuer \u00e0 augmenter pendant \u00ab\u00a0des si\u00e8cles, voire des mill\u00e9naires\u00a0\u00bb. La mer, qui a d\u00e9j\u00e0 gagn\u00e9 20 cm depuis 1900, pourrait encore monter d&rsquo;environ 50 cm d&rsquo;ici 2100, m\u00eame \u00e0 +2\u00b0C.<\/p>\n<p>\u00ab\u00a0Ca semble lointain, mais des millions d&rsquo;enfants d\u00e9j\u00e0 n\u00e9s devraient \u00eatre encore bien vivants au 22e si\u00e8cle\u00a0\u00bb, souligne Jonathan Bamber, un des auteurs du rapport.<\/p>\n<p>Pour la premi\u00e8re fois, le Giec souligne \u00e9galement \u00ab\u00a0ne pas pouvoir exclure\u00a0\u00bb la survenue des \u00ab\u00a0points de bascule\u00a0\u00bb, comme la fonte de la calotte glaciaire de l&rsquo;Antarctique ou la mort des for\u00eats, qui entra\u00eeneraient le syst\u00e8me climatique vers un changement dramatique et irr\u00e9m\u00e9diable.<\/p>\n<p>Mais ce n&rsquo;est pas une raison pour abandonner le combat, au contraire, insistent scientifiques et militants. Parce que le changement climatique ne se d\u00e9cha\u00eene pas par magie \u00e0 un certain seuil : chaque fraction de degr\u00e9 compte et renforce les impacts.<\/p>\n<p>\u00ab\u00a0Nous ne sommes pas vou\u00e9s \u00e0 l&rsquo;\u00e9chec\u00a0\u00bb, assure Friederike Otto, une des auteurs.<\/p>\n<p>\u00ab\u00a0Nous ne laisserons pas ce rapport \u00eatre remis\u00e9 sur une \u00e9tag\u00e8re\u00a0\u00bb, insiste de son c\u00f4t\u00e9 Kaisa Kosonen, de Greenpeace. \u00ab\u00a0Nous l&rsquo;apporterons avec nous dans les tribunaux\u00a0\u00bb. (AFP)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le r\u00e9chauffement de la plan\u00e8te pourrait atteindre le seuil de +1,5\u00b0C autour de 2030, dix ans plus t\u00f4t qu&rsquo;estim\u00e9, mena\u00e7ant de nouveaux d\u00e9sastres \u00ab\u00a0sans pr\u00e9c\u00e9dent\u00a0\u00bb l&rsquo;humanit\u00e9, d\u00e9j\u00e0 frapp\u00e9e par des canicules et inondations en s\u00e9rie. Pire et plus vite qu&rsquo;on le craignait. A moins de trois mois de la conf\u00e9rence climat COP26 \u00e0 Glasgow, le [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":10182,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[1663,208,356,2001],"class_list":["post-10179","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technologie","tag-emissions-de-gaz-a-effet-de-serre","tag-climat","tag-rechauffement-climatique","tag-rechauffement-planete"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.9 - aioseo.com -->\n\t<meta name=\"description\" content=\"Le r\u00e9chauffement de la plan\u00e8te pourrait atteindre le seuil de +1,5\u00b0C autour de 2030, dix ans plus t\u00f4t qu&#039;estim\u00e9, mena\u00e7ant de nouveaux d\u00e9sastres &quot;sans pr\u00e9c\u00e9dent&quot; l&#039;humanit\u00e9, d\u00e9j\u00e0 frapp\u00e9e par des canicules et inondations en s\u00e9rie. 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