{"id":58906,"date":"2024-02-12T14:13:31","date_gmt":"2024-02-12T14:13:31","guid":{"rendered":"https:\/\/www.africa-press.net\/tchad\/politique\/chronique-lurgence-de-sadapter-a-la-montee-de-la-mer"},"modified":"2024-02-12T14:43:44","modified_gmt":"2024-02-12T14:43:44","slug":"chronique-lurgence-de-sadapter-a-la-montee-de-la-mer","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/chronique-lurgence-de-sadapter-a-la-montee-de-la-mer","title":{"rendered":"CHRONIQUE. L&rsquo;urgence de s&rsquo;adapter \u00e0 la mont\u00e9e de la mer"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Tchad. <\/strong><\/span>La hausse du niveau de la mer s&rsquo;acce\u0301le\u0300re de de\u0301cennie en de\u0301cennie. Environ 4 mm par an aujourd&rsquo;hui en moyenne globale, soit trois fois plus vite qu&rsquo;au de\u0301but du 20e sie\u0300cle. En atteignant la neutralite\u0301 carbone, il est possible de stabiliser la tempe\u0301rature plane\u0301taire et les e\u0301ve\u0301nements extre\u0302mes associe\u0301s ; pas le niveau de la mer. Il continuera a\u0300 grimper sur des mille\u0301naires car les calottes polaires et les glaciers de montagne s&rsquo;ajustent lentement au re\u0301chauffement et poursuivront leur fonte.<\/p>\n<p>L&rsquo;immeuble du Signal a e\u0301te\u0301 e\u0301vacue\u0301 en 2014, apre\u0300s une grande tempe\u0302te. Construit il y a plus de 50 ans a\u0300 200 me\u0300tres du rivage, le trait de co\u0302te est aujourd&rsquo;hui a\u0300 une dizaine de me\u0300tres. Le Signal est maintenant de\u0301truit.<\/p>\n<p><b>Un possible effondrement des calottes polaires<\/b><\/p>\n<p>Les effets de la monte\u0301e des eaux sont de\u0301ja\u0300 marque\u0301s avec des inondations chroniques a\u0300 mare\u0301e haute des terres les plus basses, des submersions marines de plus grande ampleur et de plus en plus destructrices lors de tempe\u0302tes et de cyclones, des salinisations de nappes phre\u0301atiques co\u0302tie\u0300res, etc. Ce n&rsquo;est que le de\u0301but ! +30 cm attendus en 2050 par rapport a\u0300 aujourd&rsquo;hui tandis qu&rsquo;ensuite, le rythme de la hausse de\u0301pend de nos e\u0301missions de CO2 a\u0300 la fois pre\u0301sentes et futures. Mais nous ne mai\u0302trisons pas tout. Nous savons que chaque dixie\u0300me de degre\u0301 supple\u0301mentaire de re\u0301chauffement nous rapproche d&rsquo;un possible effondrement des calottes polaires, qui conduirait a\u0300 une hausse d&rsquo;environ 1,7 m en 2100, entre 4 et 5 m en 2150. C&rsquo;est demain.<\/p>\n<p><b>Du temps est ne\u0301cessaire pour s&rsquo;adapter<\/b><\/p>\n<p>Conside\u0301rer ces e\u0301ventualite\u0301s est indispensable pour la gestion des risques, en particulier pour les infrastructures critiques aux dure\u0301es de vie et d&rsquo;imple\u0301mentation pluride\u0301cennales (centrales nucle\u0301aires, zones portuaires et urbaines, etc.). L&rsquo;adaptation face a\u0300 l&rsquo;irre\u0301versibilite\u0301 rele\u0300ve de l&rsquo;urgence, car du temps est ne\u0301cessaire pour organiser la protection et la relocalisation des sites, et e\u0301viter la construction de digues ou d&rsquo;enrochements qui, in fine, peuvent accentuer les vulne\u0301rabilite\u0301s. Nous n&rsquo;avons pas le choix.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/tchad\">Tchad<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Tchad. La hausse du niveau de la mer s&rsquo;acce\u0301le\u0300re de de\u0301cennie en de\u0301cennie. Environ 4 mm par an aujourd&rsquo;hui en moyenne globale, soit trois fois plus vite qu&rsquo;au de\u0301but du 20e sie\u0300cle. En atteignant la neutralite\u0301 carbone, il est possible de stabiliser la tempe\u0301rature plane\u0301taire et les e\u0301ve\u0301nements extre\u0302mes associe\u0301s ; pas le [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":58905,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[37,292,29],"class_list":["post-58906","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-tchad","tag-tchad"],"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>CHRONIQUE. 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