{"id":1000010531,"date":"2023-03-23T16:30:20","date_gmt":"2023-03-23T15:30:20","guid":{"rendered":"https:\/\/forum-engagement.org\/?p=1000010531"},"modified":"2023-03-23T16:30:21","modified_gmt":"2023-03-23T15:30:21","slug":"comment-garantir-la-securite-alimentaire-face-aux-enjeux-climatiques","status":"publish","type":"post","link":"https:\/\/forum-engagement.org\/2024\/comment-garantir-la-securite-alimentaire-face-aux-enjeux-climatiques\/","title":{"rendered":"Comment garantir la s\u00e9curit\u00e9 alimentaire face aux enjeux climatiques ?"},"content":{"rendered":"\n<p>Alors que la malnutrition touche actuellement des centaines de millions de personnes dans le monde, le d\u00e9r\u00e8glement climatique et ses cons\u00e9quences sur les cultures compromettent plus encore l\u2019acc\u00e8s \u00e0 une alimentation en quantit\u00e9 suffisante et de qualit\u00e9. Quels sont les leviers pour garantir la s\u00e9curit\u00e9 alimentaire avec de bons rendements agricoles tout en r\u00e9duisant les impacts du changement climatique ? Le point avec Christine Hatt\u00e9, g\u00e9ochimiste et g\u00e9ochronologue, et Thierry Heulin, expert en \u00e9cologie microbienne des sols.<\/p>\n\n\n\n<p><strong>Christine Hatt\u00e9&nbsp;<\/strong>(CEA) est directrice de recherche au Laboratoire des sciences du climat et de l\u2019environnement (IPSL-LSCE, unit\u00e9 mixte CEA\/CNRS\/UVSQ).<\/p>\n\n\n\n<p><strong>Thierry Heulin\u00a0<\/strong>(CNRS) est directeur de recherche \u00e0 l\u2019Institut de biosciences et biotechnologies (BIAM, unit\u00e9 mixte CEA\/CNRS\/Aix-Marseille Universit\u00e9).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Que recouvre la notion de s\u00e9curit\u00e9 alimentaire ?<\/h2>\n\n\n\n<p><strong>Thierry Heulin :&nbsp;<\/strong>On d\u00e9finit la s\u00e9curit\u00e9 alimentaire comme le fait que la production agricole doit<em><\/em><em><\/em><em><\/em><em>a&nbsp;<\/em><em>minima<\/em><em><\/em><em><\/em><em>&nbsp;<\/em>couvrir les besoins en alimentation de la population, aussi bien de fa\u00e7on quantitative que qualitative. L\u2019offre et la demande sont \u00e0 peu pr\u00e8s \u00e0 l\u2019\u00e9quilibre dans la plupart des pays riches, sauf dans des cas particuliers comme avec la guerre en Ukraine o\u00f9 l\u2019offre risque d\u2019\u00eatre en dessous de la demande pour le bl\u00e9, les prot\u00e9agineux et les ol\u00e9agineux. L\u2019\u00e9cart offre\/demande est plus important dans les pays pauvres et \u00e0 revenus interm\u00e9diaires. Les difficult\u00e9s d\u2019acc\u00e8s \u00e0 une nourriture saine et de qualit\u00e9 sont \u00e9galement plus grandes pour les populations les plus vuln\u00e9rables. La s\u00e9curit\u00e9 alimentaire peut \u00eatre compromise par plusieurs facteurs, dont les conflits comme \u00e9voqu\u00e9 pr\u00e9c\u00e9demment mais aussi les crises et fluctuations \u00e9conomiques ainsi que le&nbsp;<strong><a href=\"https:\/\/www.cea.fr\/Pages\/actualites\/environnement\/rechauffement-et-urgence-climatique.aspx\" target=\"_blank\" rel=\"noreferrer noopener\">changement climatique<\/a><\/strong>. Assurer la s\u00e9curit\u00e9 alimentaire au niveau mondial est&nbsp;<strong>l\u2019un des&nbsp;<\/strong><a href=\"https:\/\/www.un.org\/sustainabledevelopment\/fr\/hunger\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>17 objectifs de d\u00e9veloppement durable<\/strong><\/a>&nbsp;que les \u00e9tats se sont engag\u00e9s en 2015 \u00e0 atteindre d\u2019ici \u00e0 2030.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Comment le d\u00e9r\u00e8glement climatique affecte-t-il la production agricole et donc la s\u00e9curit\u00e9<br>alimentaire ?<\/h2>\n\n\n\n<p><strong>Thierry Heulin :<\/strong>\u00a0Le changement climatique, notamment la hausse des temp\u00e9ratures, a surtout des cons\u00e9quences sur\u00a0<strong><a href=\"https:\/\/www.cea.fr\/multimedia\/Pages\/videos\/culture-scientifique\/climat-environnement\/le-cycle-eau.aspx\" target=\"_blank\" rel=\"noreferrer noopener\">le cycle de l\u2019eau<\/a><\/strong>\u00a0et sur\u00a0<strong>l\u2019alimentation hydrique<\/strong>, qu\u2019elle soit humaine ou v\u00e9g\u00e9tale. L\u2019augmentation du niveau de la mer, qui est aussi\u00a0<a href=\"https:\/\/www.cea.fr\/multimedia\/Pages\/videos\/culture-scientifique\/climat-environnement\/webdoc-climat\/consequences-du-rechauffement-climatique.aspx\" target=\"_blank\" rel=\"noreferrer noopener\">un effet du changement climatique<\/a>, cr\u00e9e des zones de salinisation : l\u2019eau de mer rentre dans les terres et p\u00e9n\u00e8tre progressivement dans les nappes phr\u00e9atiques, qui sont nos r\u00e9serves en eau douce. Le pourtour m\u00e9diterran\u00e9en (Tunisie, Alg\u00e9rie, Egypte&#8230;) est particuli\u00e8rement concern\u00e9 par cette situation tout comme le Bengladesh.\u00a0<br><br><strong>Christine Hatt\u00e9 :\u00a0<\/strong>Les\u00a0<a href=\"https:\/\/www.cea.fr\/comprendre\/Pages\/climat-environnement\/essentiel-sur-evenements-climatiques-extremes.aspx\" target=\"_blank\" rel=\"noreferrer noopener\">\u00e9v\u00e9nements climatiques\u00a0extr\u00eames<\/a>\u00a0(orages de gr\u00ealons, s\u00e9cheresses, pr\u00e9cipitations&#8230;) ont \u00e9galement un impact d\u00e9sastreux sur les sols et les cultures. Le manque d\u2019eau peut \u00eatre catastrophique mais de m\u00eame son exc\u00e8s, d\u00fb \u00e0 de fortes pluies, qui peut induire une \u00e9rosion plus intense des sols. On peut avoir un accroissement du lessivage, c\u2019est-\u00e0-dire un transport des particules min\u00e9rales et de la mati\u00e8re organique associ\u00e9e porteuse des nutriments du sol et des pesticides \u00e9ventuellement utilis\u00e9s, vers les nappes phr\u00e9atiques. Avec deux cons\u00e9quences : un appauvrissement de ces sols et la pollution des eaux. \u00a0<br><br><strong>Thierry Heulin :<\/strong>\u00a0Le r\u00e9chauffement climatique a comme autre cons\u00e9quence\u00a0<strong>le d\u00e9placement de \u00ab ravageurs \u00bb<\/strong>\u00a0(insectes, champignons, micro-organismes&#8230;) dans des r\u00e9gions dont ils \u00e9taient absents par le pass\u00e9 et o\u00f9 les cultures n\u2019ont pas eu le temps de s\u2019adapter. C\u2019est le cas, par exemple, de la chenille l\u00e9gionnaire qui d\u00e9vaste le ma\u00efs et le sorgho en Afrique, en Asie et en Am\u00e9rique du Nord. Avec le r\u00e9chauffement climatique, les pr\u00e9visions actuelles laissent penser que cette chenille va aussi s\u2019introduire en Europe dans quelques ann\u00e9es et provoquer des d\u00e9g\u00e2ts majeurs. Si leur d\u00e9placement se fait via les humains et leurs marchandises, leur installation a ensuite lieu parce que le climat change. Les moyens de lutter contre ces ravageurs sont limit\u00e9s. Les insecticides chimiques sont progressivement interdits, ce qui est une bonne chose. Mais les mol\u00e9cules alternatives sont peu nombreuses. On peut utiliser le Bt, un insecticide \u00e0 base de prot\u00e9ine cristal produite par la bact\u00e9rie\u00a0<em>Bacillus thuringiensis<\/em>, avec le risque que les ravageurs s\u2019y adaptent.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-16018d1d wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-vivid-cyan-blue-background-color has-background\" href=\"https:\/\/www.cea.fr\/presse\/Pages\/actualites-communiques\/environnement\/securite-alimentaire.aspx\">Lire la suite<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Alors que la malnutrition touche actuellement des centaines de millions de personnes dans le monde, le d\u00e9r\u00e8glement climatique et ses cons\u00e9quences sur les cultures compromettent plus encore l\u2019acc\u00e8s \u00e0 une alimentation en quantit\u00e9 suffisante et de qualit\u00e9. Quels sont les leviers pour garantir la s\u00e9curit\u00e9 alimentaire avec de bons rendements agricoles tout en r\u00e9duisant les [&hellip;]<\/p>\n","protected":false},"author":38,"featured_media":1000010535,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[156],"tags":[],"class_list":{"0":"post-1000010531","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-engagements-pour-des-territoires-plus-efficients-sur-le-plan-social-et-environnemental"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Comment garantir la s\u00e9curit\u00e9 alimentaire face aux enjeux climatiques ? | Forum Engagement<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Comment garantir la s\u00e9curit\u00e9 alimentaire face aux enjeux climatiques ? | Forum Engagement\" \/>\n<meta property=\"og:description\" content=\"Alors que la malnutrition touche actuellement des centaines de millions de personnes dans le monde, le d\u00e9r\u00e8glement climatique et ses cons\u00e9quences sur les cultures compromettent plus encore l\u2019acc\u00e8s \u00e0 une alimentation en quantit\u00e9 suffisante et de qualit\u00e9. 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