{"id":5321,"date":"2026-01-06T15:55:49","date_gmt":"2026-01-06T14:55:49","guid":{"rendered":"https:\/\/martinique2050.com\/climat-le-pire-scenario-semble-le-plus-probable\/"},"modified":"2026-01-06T15:55:49","modified_gmt":"2026-01-06T14:55:49","slug":"climat-le-pire-scenario-semble-le-plus-probable","status":"publish","type":"post","link":"https:\/\/martinique2050.com\/en\/climat-le-pire-scenario-semble-le-plus-probable\/","title":{"rendered":"Climat : le pire sc\u00e9nario semble le plus probable"},"content":{"rendered":"<div class=\"entry-content\">\n<h2><strong>R\u00e9chauffement climatique : +5\u00b0C si on ne fait rien<\/strong><\/h2>\n<p><strong>Une nouvelle analyse des mod\u00e8les climatiques montre que le r\u00e9chauffement climatique le plus probable pourrait \u00eatre encore pire que ce que le GIEC avait pr\u00e9vu.<\/strong><\/p>\n<blockquote class=\"quote-solid\">\n<p><em>\u201cSi les \u00e9missions (de CO<sub>2<\/sub>) suivent un sc\u00e9nario habituel, il y a 93% de chances pour que le r\u00e9chauffement climatiqued\u00e9passe les 4 degr\u00e9s Celsius d\u2019ici \u00e0 la fin de ce si\u00e8cle\u201d<\/em>, se rapprochant de 5\u00b0C.<\/p>\n<\/blockquote>\n<p>Telle est la conclusion alarmante d\u2019une nouvelle \u00e9tude statistique r\u00e9alis\u00e9e par deux chercheurs<a href=\"https:\/\/patricktbrown.org\/2017\/11\/29\/greater-future-global-warming-inferred-from-earths-recent-energy-budget\/\"> Patrick Brown<\/a> et Ken Caldeira de la Carnegie Institution for Science \u00e0 Standford en Californie (Etats-Unis) <a href=\"https:\/\/www.nature.com\/articles\/nature24672\">publi\u00e9e par Nature<\/a>. Leurs r\u00e9sultats sugg\u00e8rent en effet que dans la fourchette de temp\u00e9rature propos\u00e9e par les mod\u00e8les les plus pessimistes du Groupe d\u2019experts intergouvernemental sur l\u2019\u00e9volution du climat (GIEC), ce serait la plus haute valeur qu\u2019il faudrait prendre en compte, et non la moyenne.<\/p>\n<p>Les mod\u00e8les climatiques sont des algorithmes qui travaillent \u00e0 partir des \u00e9quations physiques simulant le comportement de l\u2019atmosph\u00e8re et des oc\u00e9ans. Ils sont utilis\u00e9s pour pr\u00e9dire le r\u00e9chauffement climatique futur pour une augmentation donn\u00e9e de la concentration en CO<sub>2<\/sub> et des autres gaz \u00e0 effet de serre. \u201c<em>Il existe une quarantaine de mod\u00e8les climatiques mondiaux qui projettent tous diff\u00e9rents niveaux de r\u00e9chauffement climatique pour un changement donn\u00e9 des concentrations de gaz \u00e0 effet de serre, <\/em>explique ainsi Patrick Brown co-auteur de l\u2019\u00e9tude, <em>principalement parce qu\u2019il n\u2019y a pas de consensus sur la meilleure fa\u00e7on de mod\u00e9liser certains aspects du syst\u00e8me climatique\u201d.<\/em> Le plus pessimiste des sc\u00e9narios, simul\u00e9 par les mod\u00e8les dans le 5<sup>e<\/sup> rapport du GIEC est appel\u00e9 RCP (repr\u00e9sentative concentration pathway) 8,5. Il correspond \u00e0 la prolongation des \u00e9missions de CO<sub>2<\/sub> actuelles et projette de 2081 \u00e0 2100 une fourchette d\u2019augmentation de temp\u00e9rature possible entre + 2,6\u00b0C et + 4,8\u00b0C par rapport aux niveaux pr\u00e9-industriels (1860).<\/p>\n<h3>Les mod\u00e8les qui simulent le mieux la p\u00e9riode actuelle ont tendance \u00e0 projeter, pour le futur, un r\u00e9chauffement proche de 5\u00b0C !<\/h3>\n<p>Laquelle de ces deux extr\u00e9mit\u00e9s est la plus susceptible de s\u2019av\u00e9rer exacte si les \u00e9missions de CO<sub>2<\/sub> ne baissent pas ? C\u2019est la question \u00e0 laquelle ont voulu r\u00e9pondre Brown et Caldeira. Leur hypoth\u00e8se : les mod\u00e8les qui sont les plus aptes \u00e0 projeter le futur sont ceux qui doivent \u00e9galement \u00eatre les plus aptes \u00e0 simuler le climat actuel, ou d\u2019un pass\u00e9 proche, en fonction des donn\u00e9es d\u2019observation satellites r\u00e9centes. <em> \u201cIl est logique que les mod\u00e8les qui r\u00e9ussissent le mieux \u00e0 simuler les observations d\u2019aujourd\u2019hui soient les mod\u00e8les les plus fiables pour demain\u201d<\/em>, r\u00e9sume M. Caldeira. Les deux chercheurs ont donc compar\u00e9 la performance des diff\u00e9rents mod\u00e8les, aliment\u00e9s par des observations satellites r\u00e9centes de l\u2019atmosph\u00e8re actuelle. Puis ont fait tourner les mod\u00e8les les plus fiables pour obtenir des projections futures jusqu\u2019en 2100. R\u00e9sultat : les mod\u00e8les qui simulent le mieux la p\u00e9riode actuelle ont tendance \u00e0 projeter, pour le futur, un r\u00e9chauffement proche de 5\u00b0C ! Le haut de la fourchette du sc\u00e9nario RCP 8,5.<\/p>\n<p><img decoding=\"async\" src=\"data:image\/svg+xml,%3Csvg%20xmlns='http:\/\/www.w3.org\/2000\/svg'%20viewBox='0%200%200%200'%3E%3C\/svg%3E\" alt=\"\" data-lazy-src=\"..\/assets\/inline-img\/2017\/12\/15\/w453-86198-brown-caldeira-2017-nature.jpg\"><noscript><img decoding=\"async\" src=\"..\/assets\/inline-img\/2017\/12\/15\/w453-86198-brown-caldeira-2017-nature.jpg\" alt=\"\"><\/noscript><\/p>\n<p>\u201c<em>Cette \u00e9tude signifie que les mod\u00e8les les plus r\u00e9alistes nous incitent \u00e0 ne pas prendre en compte une valeur moyenne de r\u00e9chauffement mais plut\u00f4t \u00e0 aller chercher les mod\u00e8les les plus sensibles\u201d,<\/em> commente Herv\u00e9 Le Treutclimatologue sp\u00e9cialiste des mod\u00e8les de simulation climatiques,  directeur de <a href=\"https:\/\/www.ipsl.fr.\/\">l\u2019Institut Pierre-Simon-Laplace<\/a>.<\/p>\n<p>De plus elle apporte un \u00e9l\u00e9ment de r\u00e9ponse \u00e0 une question qui taraude les chercheurs : le r\u00f4le des nuages. En effet, l\u2019incertitude des mod\u00e8les est principalement due \u00e0 la grande complexit\u00e9 des processus qui entrent en jeu et principalement le r\u00f4le complexe des nuages. \u201c<em>Les nuages r\u00e9chauffent l\u2019atmosph\u00e8re par effet de serre et la refroidisse en faisant barrage au rayonnement solaire<\/em>, poursuit Herv\u00e9 Le Treut, <em>Estimer quelle tendance va l\u2019emporter dans le futur est encore tr\u00e8s ardu\u201d.<\/em> Or l\u2019analyse de Brown et Caldeira r\u00e9v\u00e8le que \u201c<em>les mod\u00e8les les plus aptes \u00e0 recr\u00e9er les conditions actuelles sont ceux qui simulent une r\u00e9duction du refroidissement d\u00fb aux nuages \u200b\u200b\u00e0 l\u2019avenir\u201d<\/em>. Un indice pour les futurs mod\u00e8les donc.<\/p>\n<h3>Cette \u00e9tude tombe \u00e0 point nomm\u00e9 dans le d\u00e9bat actuel<\/h3>\n<p>Pour le climatologue fran\u00e7ais cette \u00e9tude tombe \u00e0 point nomm\u00e9 dans le d\u00e9bat actuel, alors que vient de s\u2019achever le One Planet Summit. \u201c<em>Depuis quelques ann\u00e9es, les m\u00e9dias, les d\u00e9cideurs, les ONG, ont tendance \u00e0 r\u00e9p\u00e9ter \u00e0 l\u2019envi que si on ne fait rien en mati\u00e8re de baisse des \u00e9missions de CO<sub>2<\/sub> on aura 3\u00b0C de r\u00e9chauffement, une moyenne de la fourchette donn\u00e9e par le GIEC,<\/em> poursuit Herv\u00e9 Le Treut. <em>Mais ce n\u2019est pas fond\u00e9 !  La communaut\u00e9 scientifique n\u2019a aucune raison de penser, \u00e0 ce stade, que la moyenne des mod\u00e8les soit la meilleure valeur \u00e0 prendre en compte.\u201d<\/em><\/p>\n<p>Pour le climatologue, <em>\u201cil n\u2019est pas anodin d\u2019\u00e9liminer les sc\u00e9narios les plus extr\u00eames du discours car cela \u00e9vite de se poser la question des technologies nouvelles \u00e0 mettre en place telle que la captation du carbone, co\u00fbteuse et qui n\u2019a pas bonne presse\u201d<\/em>. Il conclut : <em>\u201cCette r\u00e9f\u00e9rence au 3\u00b0C est une mani\u00e8re de nier une partie des risques. Or le risque moyen n\u2019existe pas\u201d. <\/em>La perspective d\u2019une augmentation de pr\u00e8s de 5\u00b0C signifierait des cons\u00e9quences d\u00e9sastreuses pour les g\u00e9n\u00e9rations futures. Et aussi, pour aujourd\u2019hui, des efforts de r\u00e9duction des \u00e9missions encore plus cons\u00e9quents pour maintenir l\u2019objectif des 2\u00b0C de l\u2019accord de Paris.<\/p>\n<p>Par Elena Sender le 15.12.2017 \u00e0 18h10<\/p>\n<p><strong>in : https:\/\/www.sciencesetavenir.fr\/<\/strong><\/p>\n<\/p><\/div>","protected":false},"excerpt":{"rendered":"<p>R\u00e9chauffement climatique : +5\u00b0C si on ne fait rien Une nouvelle analyse des mod\u00e8les climatiques montre que le r\u00e9chauffement climatique le plus probable pourrait \u00eatre encore pire que ce que le GIEC avait pr\u00e9vu. \u201cSi les \u00e9missions (de CO2) suivent un sc\u00e9nario habituel, il y a 93% de chances pour que le r\u00e9chauffement climatiqued\u00e9passe les &hellip;<\/p>","protected":false},"author":1,"featured_media":5747,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_yoast_wpseo_meta-robots-noindex":"","_yoast_wpseo_canonical":"","_yoast_wpseo_opengraph-title":"","_yoast_wpseo_opengraph-description":"","_yoast_wpseo_twitter-title":"","_yoast_wpseo_twitter-description":"","footnotes":""},"categories":[1550],"tags":[1206,1308,1445],"class_list":["post-5321","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-education-env-dev-durable","tag-climat","tag-giec","tag-rechauffement-climatique"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Climat : le pire sc\u00e9nario semble le plus probable - martinique2050<\/title>\n<meta name=\"description\" content=\"R\u00e9chauffement climatique : +5\u00b0C si on ne fait rien Une nouvelle analyse des mod\u00e8les climatiques montre que le r\u00e9chauffement climatique le plus probable\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/martinique2050.com\/en\/climat-le-pire-scenario-semble-le-plus-probable\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Climat : le pire sc\u00e9nario semble le plus probable - martinique2050\" \/>\n<meta property=\"og:description\" content=\"R\u00e9chauffement climatique : +5\u00b0C si on ne fait rien Une nouvelle analyse des mod\u00e8les climatiques montre que le r\u00e9chauffement climatique le plus probable\" \/>\n<meta property=\"og:url\" content=\"https:\/\/martinique2050.com\/en\/climat-le-pire-scenario-semble-le-plus-probable\/\" \/>\n<meta property=\"og:site_name\" content=\"martinique2050\" \/>\n<meta property=\"article:published_time\" content=\"2026-01-06T14:55:49+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/martinique2050.com\/wp-content\/uploads\/2026\/01\/rechauffement-810x607-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"810\" \/>\n\t<meta property=\"og:image:height\" content=\"607\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"martinique2050\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"martinique2050\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"NewsArticle\",\"@id\":\"https:\\\/\\\/martinique2050.com\\\/climat-le-pire-scenario-semble-le-plus-probable\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/martinique2050.com\\\/climat-le-pire-scenario-semble-le-plus-probable\\\/\"},\"author\":{\"name\":\"martinique2050\",\"@id\":\"https:\\\/\\\/martinique2050.com\\\/#\\\/schema\\\/person\\\/1da9ba455c1f6650a85f3c96d1a7afbd\"},\"headline\":\"Climat : le pire sc\u00e9nario semble le plus probable\",\"datePublished\":\"2026-01-06T14:55:49+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/martinique2050.com\\\/climat-le-pire-scenario-semble-le-plus-probable\\\/\"},\"wordCount\":980,\"commentCount\":0,\"image\":{\"@id\":\"https:\\\/\\\/martinique2050.com\\\/climat-le-pire-scenario-semble-le-plus-probable\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/martinique2050.com\\\/wp-content\\\/uploads\\\/2026\\\/01\\\/rechauffement-810x607-1.jpg\",\"keywords\":[\"climat\",\"GIEC\",\"r\u00e9chauffement climatique\"],\"articleSection\":[\"Education Env. &amp; D\u00e9v. 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