{"id":7423,"date":"2022-09-16T09:30:05","date_gmt":"2022-09-16T07:30:05","guid":{"rendered":"https:\/\/sceaux-lagazette.fr\/?p=7423"},"modified":"2022-09-15T12:07:47","modified_gmt":"2022-09-15T10:07:47","slug":"dire-le-climat-en-trente-mots","status":"publish","type":"post","link":"https:\/\/sceaux-lagazette.fr\/index.php\/2022\/09\/16\/dire-le-climat-en-trente-mots\/","title":{"rendered":"Dire le climat en trente mots"},"content":{"rendered":"\n<p>Christian de Perthuis est un \u00e9conomiste. Il enseigne depuis 20 ans l\u2019universit\u00e9 Paris-Dauphine o\u00f9 il dirige la chaire Economie du Climat. Il vient de publier aux Editions De Boeck sup\u00e9rieur, <em>Climat, 30 mots pour comprendre et agir<\/em>. Il y entreprend une d\u00e9marche tr\u00e8s p\u00e9dagogique, tr\u00e8s grand public, autour de notions dont on entend tous parler, mais qu\u2019on ma\u00eetrise mal, voire pas du tout. Il entreprend surtout de montrer combien sont enchev\u00eatr\u00e9es les questions climatiques. Avis aux amateurs.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Quatre th\u00e8mes<\/h2>\n\n\n\n<p>Comme son titre l\u2019indique, le livre pr\u00e9sente 30 mots-cl\u00e9s, mais non pas par ordre alphab\u00e9tique comme dans un dictionnaire. L\u2019auteur op\u00e8re un classement par th\u00e8mes qui donne une vue imm\u00e9diate des diff\u00e9rentes approches. Ces th\u00e8mes sont au nombre de quatre. Le scientifique campe des bases de compr\u00e9hension de ce qui structure le climat et ses \u00e9volutions. Le politique \u00e9voque les actions conduites par les Etats. Le technique montre des pistes de solutions pour mener la transition. L\u2019\u00e9conomique mentionne les impacts soci\u00e9taux dans une perspective de croissance ou de d\u00e9croissance (les deux hypoth\u00e8ses sont pr\u00e9sent\u00e9es).<\/p>\n\n\n\n<p>Chaque th\u00e8me est compos\u00e9 d\u2019articles d\u2019environ 5 pages qui commencent par une d\u00e9finition du concept consid\u00e9r\u00e9 et se poursuivent par une sorte d\u2019\u00e9tat des lieux des r\u00e9flexions en cours. Evidemment, c\u2019est condens\u00e9, le livre ne fait que 173 pages et c\u2019est justement son int\u00e9r\u00eat. Les r\u00e9f\u00e9rences ne manquent pas qui renvoient \u00e0 des sources tr\u00e8s document\u00e9es. Des illustrations permettent de visualiser rapidement des probl\u00e9matiques et des tendances.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Un scoubidou de concepts<\/h2>\n\n\n\n<p>Avec les bases scientifiques, ce sont des notions comme le climat, le r\u00e9chauffement climatique, qui sont trait\u00e9es. Qu\u2019entend-on pr\u00e9cis\u00e9ment par l\u00e0. N\u2019y a-t-il pas des id\u00e9es re\u00e7ues&nbsp;? Les gaz \u00e0 effet de serre, quels sont-ils&nbsp;? Quelles en sont les \u00e9missions&nbsp;? Quels sont les sc\u00e9narios d\u2019\u00e9volution climatique&nbsp;? Il y a \u00e9galement des notions peu connues comme le for\u00e7age radiatif. Pour ma part, je ne connaissais pas. Je vous laisse le soin de d\u00e9couvrir.<\/p>\n\n\n\n<p>La deuxi\u00e8me partie, l\u2019action climatique, pr\u00e9sente les d\u00e9cisions, les strat\u00e9gies, que les Etats prennent et entreprennent pour conjurer le r\u00e9chauffement qui menace la plan\u00e8te. Ceux qui ont recul\u00e9 devant l\u2019entr\u00e9e du d\u00e9dale documentaire des <a href=\"https:\/\/unfccc.int\/fr\/processus-et-reunions\/l-accord-de-paris\/l-accord-de-paris#:~:text=Qu%27est-ce%20que%20l,vigueur%20le%204%20novembre%202016.\">accords de Paris<\/a>, \u00e9galement connus sous le plaisant sobriquet de CCNUCC (Convention-cadre des Nations unies sur les changements climatiques), ceux qui h\u00e9sitent devant la somme de <a href=\"https:\/\/www.ecologie.gouv.fr\/comprendre-giec#scroll-nav__5\">rapports du GIEC<\/a> (Groupe d&rsquo;experts intergouvernemental sur l&rsquo;\u00e9volution du climat) trouveront un grand int\u00e9r\u00eat au d\u00e9frichage fait par Christian de Perthuis.<\/p>\n\n\n\n<p>Des associations non gouvernementales sont pr\u00e9sent\u00e9es, ce qui se comprend. On reste cependant r\u00e9serv\u00e9 sur la sympathie qu\u2019\u00e9prouve l\u2019auteur \u00e0 l\u2019\u00e9gard de Greta Thunberg. Si on ne conteste pas l\u2019intelligence m\u00e9diatique de son staff, la suffisance, la fatuit\u00e9 sans frais qu\u2019elle a montr\u00e9es dans ses d\u00e9nonciations rappellent plus les provocations adolescentes qu\u2019une pens\u00e9e de l\u2019action.<\/p>\n\n\n\n<p>La troisi\u00e8me partie, Options techniques, est consacr\u00e9e aux sources d\u2019\u00e9nergie et \u00e0 leur r\u00f4le dans la transition bas carbone. On ne s\u2019\u00e9tonnera pas de la place dans le propos des \u00e9nergies renouvelables comme alternatives aux \u00e9nergies fossiles. Elles sont pr\u00e9sent\u00e9es une \u00e0 une. \u00ab&nbsp;<em>Dans le meilleur des cas, le nucl\u00e9aire jouera un r\u00f4le d\u2019appoint dans la transition bas carbone.<\/em>&nbsp;\u00bb Personnellement, ce n\u2019est pas ce que j\u2019ai retenu de mes lectures. Pas les bonnes&nbsp;?<\/p>\n\n\n\n<p>Un accent particulier est mis sur l\u2019utilisation (en l\u2019occurrence la surexploitation) des terres. Ce qui donne du relief \u00e0 l\u2019id\u00e9e centrale de la partie&nbsp;: il faut passer d\u2019une logique additive (chaque nouvelle source d\u2019\u00e9nergie s\u2019ajoute aux pr\u00e9c\u00e9dentes) \u00e0 une logique de substitution.<\/p>\n\n\n\n<p>Enfin, la partie sur les implications \u00e9conomiques met en \u00e9vidence quelques fondamentaux. Les taxes et les normes, les quotas, jouent un r\u00f4le d\u2019aiguillon dont on comprend le c\u00f4t\u00e9 essentiel dans la transformation des productions et de la consommation. On conna\u00eet les \u00e9motions auxquelles conduisent les taxes en question. Raison de plus pour savoir ce qui est attendu d\u2019elles.<\/p>\n\n\n\n<p>Un raisonnement convaincant&nbsp;: les \u00e9nergies fossiles ont \u00e9t\u00e9 longtemps critiqu\u00e9es, car non renouvelables (avec un pic de production qui s\u2019avan\u00e7ait \u00e0 grands pas). Or, explique l\u2019auteur, le probl\u00e8me n\u2019est pas l\u00e0. Au contraire, il y a trop de p\u00e9trole. Le r\u00e9chauffement climatique est une crise de l\u2019abondance et non du risque de p\u00e9nurie.<\/p>\n\n\n\n<p>On touche d\u00e8s lors \u00e0 la question croissance versus d\u00e9croissance dont on sait combien elle est sensible. L\u2019auteur reste d\u2019une grande prudence, conscient que l\u2019acceptabilit\u00e9 sociale est assez impr\u00e9visible. Aussi place-t-il des espoirs dans une baisse de la population mondiale. Moins d\u2019habitants, moins d\u2019empreinte carbone. Mais il associe \u00e0 la transition d\u00e9mographique \u00e0 \u00ab&nbsp;recul de la pauvret\u00e9, acc\u00e9l\u00e9ration du d\u00e9veloppement&nbsp;\u00bb. D\u2019o\u00f9 la question&nbsp;: comment d\u00e9finir l\u2019aisance (la non-pauvret\u00e9), le d\u00e9veloppement \u00e9conomique pour ne pas neutraliser la baisse de la population&nbsp;? Peut-\u00eatre un autre livre.<\/p>\n\n\n\n<p>On l\u2019aura compris, <em>Climat, 30 mots pour comprendre et agir<\/em> sont une introduction \u00e0 des questions complexes \u00e9crite avec une volont\u00e9 de clart\u00e9 et de simplicit\u00e9. Elle d\u00e9gage des pistes de compr\u00e9hension et de r\u00e9flexion, elle fournit des liens pour approfondir. Remercions Florence Presson, \u00e9lue sc\u00e9enne en charge des Transitions, qui nous a envoy\u00e9 le livre.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Christian de Perthuis est un \u00e9conomiste. Il enseigne depuis 20 ans l\u2019universit\u00e9 Paris-Dauphine o\u00f9 il dirige la chaire Economie du Climat. Il vient de publier aux Editions De Boeck sup\u00e9rieur, Climat, 30 mots pour comprendre et agir. Il y entreprend une d\u00e9marche tr\u00e8s p\u00e9dagogique, tr\u00e8s grand public, autour de notions&#8230;<\/p>\n","protected":false},"author":6,"featured_media":7425,"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":[260,258],"tags":[],"class_list":["post-7423","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-echos-du-fablab","category-environnement","entry","simple"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Dire le climat en trente mots - 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\/2022\/09\/16\/dire-le-climat-en-trente-mots\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Dire le climat en trente mots - La Gazette\" \/>\n<meta property=\"og:description\" content=\"Christian de Perthuis est un \u00e9conomiste. 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