{"id":13317,"date":"2024-03-03T00:05:53","date_gmt":"2024-03-03T00:05:53","guid":{"rendered":"https:\/\/www.africa-press.net\/burundi\/politique\/changement-climatique-de-possibles-points-de-bascule-des-aujourdhui"},"modified":"2024-03-03T01:22:16","modified_gmt":"2024-03-03T01:22:16","slug":"changement-climatique-de-possibles-points-de-bascule-des-aujourdhui","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/burundi\/toutes-les-actualites\/changement-climatique-de-possibles-points-de-bascule-des-aujourdhui","title":{"rendered":"Changement climatique : de possibles points de bascule d\u00e8s aujourd\u2019hui !"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Burundi. <\/strong><\/span>Cet article est extrait du mensuel Sciences et Avenir \u2013 La Recherche n\u00b0925, date\u0301 mars 2024.<\/p>\n<p>Imaginez une tour du jeu Jenga. Vous retirez les blocs un a\u0300 un, la tour devient instable mais re\u0301siste&#8230; jusqu\u2019a\u0300 ce que vous enleviez le bloc de trop et qu\u2019elle s\u2019effondre en une fraction de seconde. De manie\u0300re similaire, notre syste\u0300me terrestre comporte des points de bascule, des seuils critiques au-dela\u0300 desquels des changements majeurs, parfois irre\u0301versibles et aux conse\u0301quences immenses, peuvent survenir rapidement.<\/p>\n<p><b>Le de\u0301pe\u0301rissement de l\u2019Amazonie<\/b><\/p>\n<p>Par exemple, l\u2019Amazonie fournit une grande partie de ses propres pre\u0301cipitations par e\u0301change d\u2019eau entre l\u2019atmosphe\u0300re locale et la ve\u0301ge\u0301tation. La de\u0301forestation et les se\u0301cheresses de plus en plus re\u0301currentes dues au changement climatique peuvent perturber ce me\u0301canisme, poussant le syste\u0300me a\u0300 franchir un point de bascule ou\u0300 la fore\u0302t se transforme en savane. Ce de\u0301pe\u0301rissement de l\u2019Amazonie serait une catastrophe pour la biodiversite\u0301, les populations du bassin amazonien et la plane\u0300te entie\u0300re au climat global alors modifie\u0301.<\/p>\n<p><b>La meilleure pre\u0301vention est de limiter le re\u0301chauffement<\/b><\/p>\n<p>L\u2019effondrement des calottes glaciaires ou la libe\u0301ration de carbone due a\u0300 la fonte du perge\u0301lisol seraient aussi des points de bascule amplifiant conside\u0301rablement la hausse du niveau de la mer et l\u2019amplitude du re\u0301chauffement. L\u2019e\u0301tat des connaissances scientifiques ne permet pas de chiffrer pre\u0301cise\u0301ment les seuils de basculement, mais donne des fourchettes de re\u0301chauffement global dans lesquelles ils risquent de se de\u0301clencher.<\/p>\n<p>A\u0300 +1,1 \u00b0C aujourd\u2019hui par rapport aux tempe\u0301ratures pre\u0301industrielles, nous entrons de\u0301ja\u0300 dans le monde possible de certains points de bascule et leur risque de de\u0301clenchement augmente nettement avec chaque fraction de degre\u0301 supple\u0301mentaire. La meilleure pre\u0301vention est de limiter le re\u0301chauffement au niveau le plus bas possible.<\/p>\n<p>Par Ce\u0301line Guivarch, directrice de recherche a\u0300 l\u2019E\u0301cole des ponts, auteure principale du 6e rapport du Giec (Groupe d\u2019experts intergouvernemental sur l\u2019e\u0301volution du climat), groupe 3. Et Christophe Cassou, directeur de recherche au CNRS, auteur principal du 6e rapport du Giec, groupe 1.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/burundi\">Burundi<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Burundi. Cet article est extrait du mensuel Sciences et Avenir \u2013 La Recherche n\u00b0925, date\u0301 mars 2024. Imaginez une tour du jeu Jenga. Vous retirez les blocs un a\u0300 un, la tour devient instable mais re\u0301siste&#8230; jusqu\u2019a\u0300 ce que vous enleviez le bloc de trop et qu\u2019elle s\u2019effondre en une fraction de seconde. [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":13316,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,48,45],"class_list":["post-13317","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-burundi","tag-burundi"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Changement climatique : de possibles points de bascule d\u00e8s aujourd\u2019hui ! - Burundi<\/title>\n<meta name=\"description\" content=\"Cet article est extrait du mensuel Sciences et Avenir \u2013 La Recherche n\u00b0925, date\u0301 mars 2024. 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