{"id":42167,"date":"2024-12-17T09:30:48","date_gmt":"2024-12-17T08:30:48","guid":{"rendered":"https:\/\/sceaux-lagazette.fr\/?p=42167"},"modified":"2024-12-16T13:16:49","modified_gmt":"2024-12-16T12:16:49","slug":"des-forets-des-arbres-et-des-hommes-un-livre-de-a-j-guerin-et-p-mathis","status":"publish","type":"post","link":"https:\/\/sceaux-lagazette.fr\/index.php\/2024\/12\/17\/des-forets-des-arbres-et-des-hommes-un-livre-de-a-j-guerin-et-p-mathis\/","title":{"rendered":"Des for\u00eats, des arbres et des hommes, un livre de A-J. Gu\u00e9rin et P. Mathis"},"content":{"rendered":"\n<p>Imaginez un narrateur pas comme les autres : Pando, un arbre vieux de 80 000 ans qui est aussi toute une for\u00eat. Situez dans l&rsquo;Utah aux \u00c9tats-Unis cet \u00eatre extraordinaire compos\u00e9 de 47 000 troncs r\u00e9partis sur 43 hectares. Il forme une unique colonie de faux-trembles. Sa voix est celle que les auteurs ont choisie pour parler des arbres, des for\u00eats et de leur relation avec l&rsquo;humanit\u00e9. Son impact environnemental en jette : \u00ab\u00a0<em>\u00c0 moi tout seul, nous dit-il, je retiens entre 1000 et 1500 tonnes de carbone, soit l&rsquo;\u00e9quivalent de 3700 \u00e0 5500 tonnes de CO2<\/em>.\u00a0\u00bb<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Les auteurs et leur approche<\/h2>\n\n\n\n<p>La force de <em>Des for\u00eats, des arbres et des hommes<\/em> r\u00e9side dans la compl\u00e9mentarit\u00e9 de ses auteurs. Andr\u00e9-Jean Gu\u00e9rin, polytechnicien, apporte son expertise en d\u00e9veloppement durable et en politique environnementale, forg\u00e9e notamment \u00e0 la direction de la Fondation Nicolas Hulot et au Conseil \u00e9conomique, social et environnemental. Paul Mathis, qui vit par parenth\u00e8se \u00e0 Sceaux, est agronome et biophysicien. Il enrichit le r\u00e9cit de sa profonde connaissance de la photosynth\u00e8se et des m\u00e9canismes de conversion de l&rsquo;\u00e9nergie solaire.<\/p>\n\n\n\n<p>Ce qui rend leur approche particuli\u00e8rement r\u00e9ussie, c&rsquo;est leur capacit\u00e9 \u00e0 transmettre des connaissances scientifiques complexes \u00e0 travers une narration accessible. Pando, malgr\u00e9 toute sa science, s&rsquo;exprime simplement et nous guide \u00e0 travers les myst\u00e8res de la vie des arbres.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Biologie et fonctionnement des arbres<\/h2>\n\n\n\n<p>La photosynth\u00e8se occupe une place centrale dans le r\u00e9cit. Pando explique comment ce processus fondamental permet aux arbres d&rsquo;occuper une position unique dans le monde vivant.<\/p>\n\n\n\n<p>Avec la photosynth\u00e8se, les v\u00e9g\u00e9taux captent du CO2 atmosph\u00e9rique. Ils retiennent le carbone et le stockent dans les parties a\u00e9riennes des arbres le tronc, les branches, et dans leur partie souterraine, les racines. Ils rejettent l\u2019oxyg\u00e8ne dans l\u2019air.<\/p>\n\n\n\n<p>Gr\u00e2ce \u00e0 ce m\u00e9canisme, les v\u00e9g\u00e9taux deviennent autonomes \u00e9nerg\u00e9tiquement et nourrissent l&rsquo;ensemble de l&rsquo;\u00e9cosyst\u00e8me. Ils alimentent la vie des sols &#8211; champignons, insectes, rongeurs, bact\u00e9ries &#8211; et assurent leur fertilit\u00e9, tout en fournissant \u00e9nergie et biomol\u00e9cules aux autres formes de vie.<\/p>\n\n\n\n<p>C\u2019est pourquoi le r\u00f4le des for\u00eats dans la lutte contre le changement climatique est essentiel. Pando insiste dans ses d\u00e9monstrations. Il les d\u00e9taille pour montrer en quoi le r\u00f4le d\u00e9pend de la bonne sant\u00e9 et de la pr\u00e9servation des arbres.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">L\u2019homme et la for\u00eat<\/h2>\n\n\n\n<p>Le livre retrace l&rsquo;\u00e9volution dans la longue dur\u00e9e de notre rapport \u00e0 la for\u00eat. Il y a 100.000 ans, l&rsquo;impact humain sur l&rsquo;environnement \u00e9tait minimal. Puis vint la r\u00e9volution n\u00e9olithique, il y a environ 10.000 ans. On la r\u00e9sume souvent par la domestication des plantes et des animaux. Elle est marqu\u00e9e en fait par quatre innovations majeures : l&rsquo;agriculture, la s\u00e9dentarisation, les outils et la poterie. Cette p\u00e9riode marque le d\u00e9but d&rsquo;une transformation profonde dans la relation entre l&rsquo;homme et la for\u00eat.<\/p>\n\n\n\n<p>Pando nous raconte comment les menaces ont \u00e9volu\u00e9 au fil du temps. Ses ennemis d\u2019autrefois \u00e9taient des \u00e9lans et des chevreuils qui s\u2019attaquaient aux feuilles et aux bourgeons \u00e0 port\u00e9e de leurs dents. On sait que les d\u00e9fis contemporains sont bien plus graves. Pando d\u00e9crit les cons\u00e9quences sur les for\u00eats de leur surexploitation, de l&rsquo;augmentation massive de la population humaine.<\/p>\n\n\n\n<p>La d\u00e9forestation massive est au c\u0153ur des pr\u00e9occupations du livre : \u00ab&nbsp;<em>Au cours de la r\u00e9cente d\u00e9cennie, les pertes nettes de surface foresti\u00e8re se sont encore \u00e9lev\u00e9es \u00e0 31.000 km\u00b2 par an.&nbsp;<\/em>\u00bb L&rsquo;accent est particuli\u00e8rement mis sur l&rsquo;Amazonie, poumon vert de la plan\u00e8te dont la pr\u00e9servation est vitale pour le climat mondial et la biodiversit\u00e9.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Espoir quand m\u00eame<\/h2>\n\n\n\n<p>La conclusion du livre m\u00eale inqui\u00e9tude et espoir. Pando, malgr\u00e9 ses 80.000 ans d&rsquo;existence, s&rsquo;inqui\u00e8te pour son avenir. Toutefois, il observe une prise de conscience croissante de la responsabilit\u00e9 humaine envers les for\u00eats. Le livre se termine par un appel \u00e0 l&rsquo;action, rappelant l&rsquo;exemple inspirant de <em>L&rsquo;Homme qui plantait des arbres<\/em> de Giono, sugg\u00e9rant que des actions individuelles, m\u00eame modestes, peuvent avoir un impact significatif sur l&rsquo;avenir de nos for\u00eats.<\/p>\n\n\n\n<p>Les auteurs ont r\u00e9ussi \u00e0 cr\u00e9er un ouvrage qui allie rigueur scientifique, perspective historique et message environnemental urgent, le tout port\u00e9 par la voix originale et attachante de Pando.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Imaginez un narrateur pas comme les autres : Pando, un arbre vieux de 80 000 ans qui est aussi toute une for\u00eat. Situez dans l&rsquo;Utah aux \u00c9tats-Unis cet \u00eatre extraordinaire compos\u00e9 de 47 000 troncs r\u00e9partis sur 43 hectares. Il forme une unique colonie de faux-trembles. Sa voix est celle&#8230;<\/p>\n","protected":false},"author":20,"featured_media":42277,"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":[242],"tags":[],"class_list":["post-42167","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-litterature","entry","simple"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Des for\u00eats, des arbres et des hommes, un livre de A-J. Gu\u00e9rin et P. 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