{"id":2572106,"date":"2024-12-24T10:26:13","date_gmt":"2024-12-24T10:26:13","guid":{"rendered":"https:\/\/www.pressenza.com\/?p=2572106"},"modified":"2024-12-24T10:26:13","modified_gmt":"2024-12-24T10:26:13","slug":"est-il-encore-possible-de-limiter-le-rechauffement-climatique-a-15c","status":"publish","type":"post","link":"https:\/\/www.pressenza.com\/fr\/2024\/12\/est-il-encore-possible-de-limiter-le-rechauffement-climatique-a-15c\/","title":{"rendered":"Est-il encore possible de limiter le r\u00e9chauffement climatique \u00e0 1,5\u00b0C ?"},"content":{"rendered":"<p>Alors que les dirigeants mondiaux se sont r\u00e9unis \u00e0 la COP29 en Azerba\u00efdjan pour discuter de l\u2019action climatique, des scientifiques se demandent s\u2019il est encore possible de limiter le r\u00e9chauffement de la plan\u00e8te \u00e0 1,5 degr\u00e9 Celsius par rapport aux moyennes pr\u00e9industrielles.<\/p>\n<p>Par Paige Bennett<\/p>\n<p>Selon un r\u00e9cent rapport du Copernicus Climate Change Service (C3S) de l\u2019Union europ\u00e9enne, le r\u00e9chauffement climatique devrait<a href=\"https:\/\/www.ecowatch.com\/2024-likely-to-breach-1-5c-threshold-for-first-time-and-be-earths-warmest-year-on-record-c3s-report.html\"> d\u00e9passer 1,5 degr\u00e9 Celsius<\/a> en 2024, et ce, pour la premi\u00e8re fois. Ce rapport indique \u00e9galement que 2024 sera probablement l\u2019ann\u00e9e la plus chaude jamais enregistr\u00e9e, plus chaude encore que 2023, qui d\u00e9tient actuellement le record de chaleur. En outre, de juin 2023 \u00e0 mai 2024, les temp\u00e9ratures ont d\u00e9pass\u00e9<a href=\"https:\/\/www.ecowatch.com\/global-average-temperature-record-climate-change-2024.html\"> \u00a0de plus de 1,63 degr\u00e9 Celsius<\/a> les moyennes de la p\u00e9riode pr\u00e9industrielle pendant 12 mois cons\u00e9cutifs.<\/p>\n<p>Aujourd\u2019hui, les donn\u00e9es scientifiques montrent qu\u2019il est de moins en moins plausible de pouvoir contenir le r\u00e9chauffement climatique \u00e0 la limite de 1,5 degr\u00e9 Celsius fix\u00e9 par l\u2019<a href=\"https:\/\/unfccc.int\/process-and-meetings\/the-paris-agreement\">Accord de Paris<\/a>. Certains experts alertent sur le fait que nous avons peut-\u00eatre d\u00e9j\u00e0 d\u00e9pass\u00e9 le stade de la simple r\u00e9gulation du r\u00e9chauffement climatique.<\/p>\n<blockquote><p>\u00ab L\u2019objectif de rester sous la barre des 1,5\u00b0C est mort et enterr\u00e9. Il est quasiment impossible de l\u2019\u00e9viter \u00e0 ce stade, car nous avons attendu trop longtemps pour agir \u00bb, a d\u00e9clar\u00e9 Zeke Hausfather, responsable de la recherche sur le climat chez Stripe et chercheur chez Berkeley Earth, <a href=\"https:\/\/www.theguardian.com\/environment\/2024\/nov\/18\/climate-crisis-world-temperature-target\">au Guardian<\/a>. Nous avons d\u00e9pass\u00e9 la limite des 1,5 degr\u00e9 \u00e0 une vitesse alarmante et cela continuera tant que les \u00e9missions mondiales continueront d\u2019augmenter.<\/p><\/blockquote>\n<p>La limite de 1,5 degr\u00e9 Celsius a \u00e9t\u00e9 fix\u00e9e par l\u2019Accord de Paris, un trait\u00e9 international n\u00e9goci\u00e9 lors de la Conf\u00e9rence des Nations unies sur le Changement climatique (COP21) en 2015 et sign\u00e9 en 2016. Cet<a href=\"https:\/\/www.un.org\/en\/climatechange\/science\/climate-issues\/degrees-matter\"> objectif a \u00e9t\u00e9 fix\u00e9<\/a> afin d\u2019\u00e9viter les effets catastrophiques du changement climatique, tels que des inondations, ouragans, s\u00e9cheresses, vagues de chaleur et incendies de for\u00eat plus fr\u00e9quents et plus intenses.<\/p>\n<p>Selon une \u00e9tude r\u00e9alis\u00e9e en 2022, une augmentation de la temp\u00e9rature de plus de 1,5 degr\u00e9 Celsius pourrait \u00e9galement entra\u00eener de<a href=\"https:\/\/www.science.org\/doi\/10.1126\/science.abn7950\"> nombreux points de basculement climatiques<\/a>, notamment des perturbations de la circulation oc\u00e9anique, le d\u00e9p\u00e9rissement de la for\u00eat amazonienne, la disparition massive des r\u00e9cifs coralliens, l\u2019effondrement de la banquise et de la calotte glaciaire, etc.<\/p>\n<p>Les Nations unies ont soulign\u00e9 que les d\u00e9passements mensuels et annuels de la limite de 1,5 degr\u00e9 ne signifient pas n\u00e9cessairement que nous avons d\u00e9pass\u00e9 le point de r\u00e9f\u00e9rence de l\u2019Accord de Paris. N\u00e9anmoins, nous nous rapprochons d\u2019un d\u00e9passement sur le long terme, ce qui pourrait avoir des cons\u00e9quences irr\u00e9versibles.<\/p>\n<p>Richard Betts, climatologue \u00e0 l\u2019universit\u00e9 d\u2019Exeter au Royaume-Uni, a d\u00e9clar\u00e9 \u00e0 la NPR que le<a href=\"https:\/\/www.npr.org\/2024\/11\/18\/nx-s1-5183222\/1-5-celsius-global-warming-climate-change-cop29\"> d\u00e9passement du seuil de r\u00e9f\u00e9rence<\/a> est \u00ab une question de quand, et non pas de si \u00bb.<\/p>\n<p>Andrew Jarvis, climatologue \u00e0 l\u2019universit\u00e9 de Lancaster, a d\u00e9clar\u00e9 \u00e0 la NPR que le monde pourrait d\u00e9passer le seuil fix\u00e9 dans les dix prochaines ann\u00e9es. Cependant, les m\u00e9thodes actuelles de mesure du r\u00e9chauffement par rapport \u00e0 la p\u00e9riode pr\u00e9industrielle \u00e9taient ax\u00e9es sur des intervalles r\u00e9trospectifs de 20 ans, ce qui signifie que nous pourrions rater le coche bien avant que des mesures nous le fassent r\u00e9aliser.<\/p>\n<p>Selon le rapport du Programme des Nations unies pour l\u2019environnement (PNUE) sur les<a href=\"https:\/\/www.ecowatch.com\/unep-emissions-gap-report-2024-climate-crisis.html\"> \u00e9carts d\u2019\u00e9missions<\/a>, publi\u00e9 en octobre 2024, le monde devra r\u00e9duire ses \u00e9missions de 42 % d\u2019ici \u00e0 2030 et de 57 % d\u2019ici \u00e0 2035 pour ne pas d\u00e9passer le seuil de 1,5 degr\u00e9. Un autre rapport, publi\u00e9 la semaine derni\u00e8re, indique que les politiques actuelles entra\u00eeneront une augmentation, et non une r\u00e9duction des \u00e9missions, ce qui pourrait provoquer un r\u00e9chauffement de<a href=\"https:\/\/www.ecowatch.com\/climate-action-tracker-report-2024-global-warming-projection.html\"> 2,7 degr\u00e9s Celsius<\/a> d\u2019ici \u00e0 2100.<\/p>\n<p>En fin de compte, les scientifiques ont d\u00e9clar\u00e9 qu\u2019une action climatique imm\u00e9diate et massive sera n\u00e9cessaire pour minimiser autant que possible le r\u00e9chauffement, car chaque fraction de degr\u00e9 \u00e9vit\u00e9 fera une diff\u00e9rence significative.<\/p>\n<blockquote><p>\u00ab Nous nous rapprochons de points de basculement dans le syst\u00e8me climatique qui pourraient devenir irr\u00e9versibles ; on ne sait pas quand ils arriveront, ils sont comme des monstres dans l\u2019obscurit\u00e9 \u00bb, a d\u00e9clar\u00e9 Grahame Madge, porte-parole du Met Office britannique, comme l\u2019a rapport\u00e9 The Guardian. \u00ab Il est pr\u00e9f\u00e9rable de ne pas d\u00e9passer 1,5 \u00b0C, mais, si \u00e7a devait arriver, mieux vaut viser 1,6 \u00b0C plut\u00f4t que 1,7 \u00b0C, ce qui est pr\u00e9f\u00e9rable \u00e0 2 \u00b0C ou plus \u00bb.<\/p><\/blockquote>\n<p><iframe loading=\"lazy\" title=\"The Tipping Points of Climate Change \u2014 and Where We Stand | Johan Rockstr\u00f6m | TED\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/Vl6VhCAeEfQ?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<hr \/>\n<p><span style=\"color: #666699;\">Bas\u00e9e \u00e0 Los Angeles, Paige est une \u00e9crivaine passionn\u00e9e par le d\u00e9veloppement durable. Elle a obtenu une licence en journalisme \u00e0 l&rsquo;universit\u00e9 de l&rsquo;Ohio et un certificat en \u00c9tudes sur les Femmes, le Genre et la Sexualit\u00e9. Elle s&rsquo;est \u00e9galement sp\u00e9cialis\u00e9e dans l&rsquo;agriculture durable pendant ses \u00e9tudes de premier cycle.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><em>Traduit de l&rsquo;anglais par <a href=\"https:\/\/www.linkedin.com\/in\/emma-guiguin\/\">Emma Guiguin<\/a><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Alors que les dirigeants mondiaux se sont r\u00e9unis \u00e0 la COP29 en Azerba\u00efdjan pour discuter de l\u2019action climatique, des scientifiques se demandent s\u2019il est encore possible de limiter le r\u00e9chauffement de la plan\u00e8te \u00e0 1,5 degr\u00e9 Celsius par rapport aux&hellip;<\/p>\n","protected":false},"author":1195,"featured_media":2572112,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[97,40,95],"tags":[130553,3877],"class_list":["post-2572106","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-environnement-et-ecologie","category-international-fr","category-affaires-etrangeres","tag-rechauffement","tag-rechauffement-climatique"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Est-il encore possible de limiter le r\u00e9chauffement climatique \u00e0 1,5\u00b0C ?<\/title>\n<meta name=\"description\" content=\"Alors que les dirigeants mondiaux se sont r\u00e9unis \u00e0 la COP29 en Azerba\u00efdjan pour discuter de l\u2019action climatique, des scientifiques se demandent s\u2019il est\" \/>\n<meta name=\"robots\" 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