{"id":4834,"date":"2021-10-23T11:05:45","date_gmt":"2021-10-23T09:05:45","guid":{"rendered":"https:\/\/sceaux-lagazette.fr\/?p=4834"},"modified":"2021-10-23T11:05:46","modified_gmt":"2021-10-23T09:05:46","slug":"le-rapport-du-giec","status":"publish","type":"post","link":"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/10\/23\/le-rapport-du-giec\/","title":{"rendered":"Le rapport du GIEC"},"content":{"rendered":"\n<p>Le groupe d\u2019experts intergouvernemental sur l\u2019\u00e9volution du climat (GIEC) a remis cet \u00e9t\u00e9 (le 9 ao\u00fbt 2021) <a href=\"https:\/\/www.ipcc.ch\/languages-2\/francais\/\" target=\"_blank\" rel=\"noreferrer noopener\">le premier volet<\/a> son 6<sup>e<\/sup> rapport. Le rapport complet devrait \u00eatre finalis\u00e9 au 2<sup>e<\/sup> trimestre 2022.<\/p>\n\n\n\n<p>Le <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Cinqui%C3%A8me_rapport_d%27%C3%A9valuation_du_GIEC\" target=\"_blank\" rel=\"noreferrer noopener\">5<sup>e<\/sup> rapport<\/a> avait \u00e9t\u00e9 publi\u00e9 en 2014. Ce nouveau rapport prend donc en compte 7 nouvelles ann\u00e9es de d\u00e9r\u00e8glement climatique ainsi qu\u2019environ 14.000 articles scientifiques produits depuis.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Les principales conclusions<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>La vitesse \u00e0 laquelle a lieu le changement climatique ne laisse aucun doute sur son origine li\u00e9e \u00e0 l\u2019activit\u00e9 humaine&nbsp;: <em>ll est incontestable que l&rsquo;influence humaine a r\u00e9chauff\u00e9 l\u2019atmosph\u00e8re, l\u2019oc\u00e9an et les terres. Des changements rapides et g\u00e9n\u00e9ralis\u00e9s se sont produits dans l&rsquo;atmosph\u00e8re, les oc\u00e9ans, la cryosph\u00e8re et la biosph\u00e8re.<\/em><\/li><li>Entre la p\u00e9riode 1850\/1900 et la p\u00e9riode 2010\/2020, on observe une augmentation de temp\u00e9rature moyenne de 1,1\u00b0C \u00e0 la surface du globe<\/li><li>Le changement n\u2019affecte pas que la temp\u00e9rature, mais aussi le niveau des mers, la surface des glaciers et de la banquise, la fr\u00e9quence et l\u2019intensit\u00e9 des \u00e9v\u00e9nements climatiques extr\u00eames (canicules, temp\u00eates, s\u00e9cheresses, fortes pr\u00e9cipitations, vagues de chaleur\u2026)<\/li><li>Ce changement va continuer et m\u00eame s\u2019acc\u00e9l\u00e9rer dans les prochaines d\u00e9cennies, mais dans des proportions qui d\u00e9pendent de l\u2019\u00e9volution des \u00e9missions de gaz \u00e0 effets de serre<ul><li>Limiter le r\u00e9chauffement \u00e0 1,5% suppose une r\u00e9duction drastique et rapide des \u00e9missions (probabilit\u00e9 que cela se produise, quasi nulle).<\/li><\/ul><ul><li>Limiter le r\u00e9chauffement \u00e0 2% suppose l\u2019engagement de politiques tr\u00e8s s\u00e9v\u00e8res de restriction de l\u2019usage des \u00e9nergies fossiles et de nombreux autres \u00e9l\u00e9ments d\u2019une politique climatique efficace. Sa probabilit\u00e9 est faible, mais ce sc\u00e9nario ne peut \u00eatre \u00e9cart\u00e9.<\/li><\/ul><ul><li>Si on continue sur la trajectoire actuelle, on obtient un r\u00e9chauffement d\u2019environ 4\u00b0C \u00e0 l\u2019horizon 2100.<\/li><\/ul><ul><li>Dans tous les cas, le r\u00e9chauffement se poursuivra dans les prochaines ann\u00e9es. L\u2019impact d\u2019\u00e9ventuelles r\u00e9ductions des \u00e9missions n\u2019a gu\u00e8re d\u2019effet visible avant au moins 10 ans, mais en a de plus en plus importantes avec le temps.<\/li><\/ul><\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"895\" height=\"408\" src=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2021\/10\/GIEC-Masson-Delmotte-1.png\" alt=\"\" class=\"wp-image-4837\" srcset=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2021\/10\/GIEC-Masson-Delmotte-1.png 895w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2021\/10\/GIEC-Masson-Delmotte-1-300x137.png 300w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2021\/10\/GIEC-Masson-Delmotte-1-768x350.png 768w\" sizes=\"(max-width: 895px) 100vw, 895px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\"><li>Les effets seront multiples et affecteront diff\u00e9remment les zones du globe<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Le r\u00f4le des diff\u00e9rents polluants<\/h2>\n\n\n\n<p>Le r\u00e9chauffement observ\u00e9 est la r\u00e9sultante des effets de diff\u00e9rents polluants, dont en premier lieu le C02 et le m\u00e9thane, la pollution et les a\u00e9rosols jouant au contraire dans le sens d\u2019un refroidissement.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"502\" src=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2021\/10\/GIEC-MD-2-1024x502.png\" alt=\"\" class=\"wp-image-4838\" srcset=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2021\/10\/GIEC-MD-2-1024x502.png 1024w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2021\/10\/GIEC-MD-2-300x147.png 300w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2021\/10\/GIEC-MD-2-768x377.png 768w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2021\/10\/GIEC-MD-2.png 1280w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">On peut d\u00e9j\u00e0 observer le r\u00e9chauffement dans notre pays<\/h2>\n\n\n\n<p>Le d\u00e9r\u00e8glement climatique se manifeste aujourd\u2019hui en France de diff\u00e9rentes mani\u00e8res&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Par des <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Records_de_temp%C3%A9rature_en_France_m%C3%A9tropolitaine\" target=\"_blank\" rel=\"noreferrer noopener\">records de temp\u00e9ratures<\/a>&nbsp;: dans beaucoup de d\u00e9partements, les r<a href=\"https:\/\/meteofrance.com\/magazine\/meteo-questions\/quelle-est-la-temperature-la-plus-elevee-enregistree-en-france\" target=\"_blank\" rel=\"noreferrer noopener\">ecords de temp\u00e9rature<\/a> ont \u00e9t\u00e9 battus en 2019. La temp\u00e9rature la plus \u00e9lev\u00e9e, 46\u00b0C a \u00e9t\u00e9 enregistr\u00e9e dans l\u2019H\u00e9rault. Le record pr\u00e9c\u00e9dent \u00e9tait de 44,1\u00b0C en 2003 dans le Gard,<\/li><li>Par <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Records_de_temp%C3%A9rature_en_France_m%C3%A9tropolitaine#Canicules\" target=\"_blank\" rel=\"noreferrer noopener\">des canicules r\u00e9p\u00e9t\u00e9es<\/a>&nbsp;: sur les 11 canicules r\u00e9pertori\u00e9es depuis 1947, 5 ont eu lieu pendant la d\u00e9cennie 2011\/2020,<\/li><li>Par une augmentation de la temp\u00e9rature moyenne&nbsp;: les 6 ann\u00e9es les plus chaudes en France ont toutes eu lieu depuis 2010,<\/li><li>Par l\u2019augmentation des <a href=\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/08\/31\/lete-2021-et-les-incendies-de-foret\/\" target=\"_blank\" rel=\"noreferrer noopener\">feux de for\u00eat<\/a>&nbsp;: si la politique de pr\u00e9vention mise en place depuis 30 ans a permis de diminuer les surfaces br\u00fbl\u00e9es, on constate <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Feu_de_for%C3%AAt#Feux_de_for%C3%AAt_en_France\" target=\"_blank\" rel=\"noreferrer noopener\">une augmentation<\/a> des conditions favorables aux d\u00e9parts de feux,<\/li><li>Par une augmentation des fortes pr\u00e9cipitations, comme <a href=\"https:\/\/www.meteo-paris.com\/actualites\/orages-et-fortes-pluies-un-arrosage-tres-inegal-en-france-en-septembre-2021\" target=\"_blank\" rel=\"noreferrer noopener\">r\u00e9cemment<\/a> dans le sud&nbsp;: 194 mm en 48 heures \u00e0 Marseille les 3 et4 octobre, 458 mm \u00e0 Villefort en Loz\u00e8re en 24 h le 3 octobre,<\/li><li>Par des <a href=\"https:\/\/actu.fr\/sciences-technologie\/carte-million-francais-sont-menaces-par-montee-eaux-etes-vous-concerne_29029824.html\" target=\"_blank\" rel=\"noreferrer noopener\">menaces de mont\u00e9e des eaux <\/a>sur certains littoraux, notamment en Nouvelle Aquitaine.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Les cons\u00e9quences attendues en Europe<\/h2>\n\n\n\n<p>Le rapport se livre \u00e0 des prospectives, dont voici la teneur&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>R\u00e9chauffement \u00e0 un rythme sup\u00e9rieur \u00e0 la moyenne mondiale,<\/li><li>D\u00e9passement de seuils de chaleur critiques pour un r\u00e9chauffement global sup\u00e9rieur \u00e0 2\u00b0C,<\/li><li>Hausse des pr\u00e9cipitations hivernales en Europe du Nord,<\/li><li>Baisse des pr\u00e9cipitations estivales m\u00e9diterran\u00e9ennes s&rsquo;\u00e9tendant vers le nord,<\/li><li>Hausse des pr\u00e9cipitations extr\u00eames dans la plupart des r\u00e9gions,<\/li><li>Hausse du niveau relatif de la mer (hors Baltique) sup\u00e9rieure ou \u00e9gale \u00e0 la moyenne mondiale,<\/li><li>Hausse de la fr\u00e9quence et de l\u2019intensit\u00e9 des \u00e9v\u00e9nements extr\u00eames li\u00e9s au niveau de la mer,<\/li><li>Recul du littoral le long des c\u00f4tes sableuses,<\/li><li>Fort recul des glaciers, du perg\u00e9lisol, de l&rsquo;\u00e9tendue et de la dur\u00e9e de la couverture neigeuse.<\/li><\/ul>\n\n\n\n<p>Et en images pour le monde :<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"506\" src=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2021\/10\/GIEC-MD-3-1024x506.png\" alt=\"\" class=\"wp-image-4839\" srcset=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2021\/10\/GIEC-MD-3-1024x506.png 1024w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2021\/10\/GIEC-MD-3-300x148.png 300w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2021\/10\/GIEC-MD-3-768x379.png 768w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2021\/10\/GIEC-MD-3.png 1280w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Le pr\u00e9sent article s\u2019appuie notamment sur la <a rel=\"noreferrer noopener\" href=\"https:\/\/sharebox.lsce.ipsl.fr\/index.php\/s\/Xvdb1wX1Mnw8xqI\" target=\"_blank\">pr\u00e9sentation<\/a> r\u00e9sum\u00e9e en Fran\u00e7ais r\u00e9alis\u00e9e par Val\u00e9rie Masson Delmotte, pal\u00e9o-climatologue au Laboratoire des sciences du climat et de l\u2019environnement (CNRS).<\/p>\n\n\n\n<p>Le CNRS a r\u00e9alis\u00e9 \u00e0 partir des conclusions du 6\u00e8me rapport <a rel=\"noreferrer noopener\" href=\"https:\/\/www.youtube.com\/watch?v=64xNugjI6jc\" target=\"_blank\">un film d&rsquo;animation<\/a> d&rsquo;environ 6 minutes portant sur l&rsquo;\u00e9volution du climat en Europe d&rsquo;ici 2050.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le groupe d\u2019experts intergouvernemental sur l\u2019\u00e9volution du climat (GIEC) a remis cet \u00e9t\u00e9 (le 9 ao\u00fbt 2021) le premier volet son 6e rapport. Le rapport complet devrait \u00eatre finalis\u00e9 au 2e trimestre 2022. Le 5e rapport avait \u00e9t\u00e9 publi\u00e9 en 2014. Ce nouveau rapport prend donc en compte 7 nouvelles&#8230;<\/p>\n","protected":false},"author":11,"featured_media":4840,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[53],"tags":[],"class_list":["post-4834","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-analyses","entry","simple"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Le rapport du GIEC - La Gazette<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/10\/23\/le-rapport-du-giec\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Le rapport du GIEC - La Gazette\" \/>\n<meta property=\"og:description\" content=\"Le groupe d\u2019experts intergouvernemental sur l\u2019\u00e9volution du climat (GIEC) a remis cet \u00e9t\u00e9 (le 9 ao\u00fbt 2021) le premier volet son 6e rapport. Le rapport complet devrait \u00eatre finalis\u00e9 au 2e trimestre 2022. Le 5e rapport avait \u00e9t\u00e9 publi\u00e9 en 2014. Ce nouveau rapport prend donc en compte 7 nouvelles&#8230;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/10\/23\/le-rapport-du-giec\/\" \/>\n<meta property=\"og:site_name\" content=\"La Gazette\" \/>\n<meta property=\"article:published_time\" content=\"2021-10-23T09:05:45+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-10-23T09:05:46+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2021\/10\/GIEC-MD-3-1.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"632\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"G\u00e9rard Bardier\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"G\u00e9rard Bardier\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/10\/23\/le-rapport-du-giec\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/10\/23\/le-rapport-du-giec\/\"},\"author\":{\"name\":\"G\u00e9rard Bardier\",\"@id\":\"https:\/\/sceaux-lagazette.fr\/#\/schema\/person\/5650e206a121f68c6f5e76379bccfbc4\"},\"headline\":\"Le rapport du GIEC\",\"datePublished\":\"2021-10-23T09:05:45+00:00\",\"dateModified\":\"2021-10-23T09:05:46+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/10\/23\/le-rapport-du-giec\/\"},\"wordCount\":838,\"commentCount\":2,\"publisher\":{\"@id\":\"https:\/\/sceaux-lagazette.fr\/#organization\"},\"image\":{\"@id\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/10\/23\/le-rapport-du-giec\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2021\/10\/GIEC-MD-3-1.png\",\"articleSection\":[\"Analyses\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/10\/23\/le-rapport-du-giec\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/10\/23\/le-rapport-du-giec\/\",\"url\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/10\/23\/le-rapport-du-giec\/\",\"name\":\"Le rapport du GIEC - 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