{"id":5906,"date":"2021-11-20T13:05:10","date_gmt":"2021-11-20T13:05:10","guid":{"rendered":"https:\/\/bluetunisia.com\/?p=5906"},"modified":"2025-07-22T13:13:40","modified_gmt":"2025-07-22T13:13:40","slug":"24-400-milliards-de-microplastiques-derivent-sur-nos-oceans","status":"publish","type":"post","link":"https:\/\/bluetunisia.com\/fr\/24-400-milliards-de-microplastiques-derivent-sur-nos-oceans\/","title":{"rendered":"24.400 milliards de microplastiques d\u00e9rivent sur nos oc\u00e9ans !"},"content":{"rendered":"\n<p>Une nouvelle \u00e9tude \u00e9value \u00e0 24.000 milliards le nombre de microplastiques pr\u00e9sents \u00e0 la surface des oc\u00e9ans. Un chiffre d\u00e9j\u00e0 impressionnant, mais qui pourrait encore augmenter, multipliant les risques pour la biodiversit\u00e9 et pour notre environnement.<\/p>\n\n\n\n<p>Toujours plus de particules de plastique? Le Centre de recherches oc\u00e9aniques et atmosph\u00e9riques de l\u2019Universit\u00e9 de Kyushu (Japon) s\u2019est pench\u00e9 sur la question. Sa&nbsp;<a href=\"https:\/\/microplastics.springeropen.com\/track\/pdf\/10.1186\/s43591-021-00013-z.pdf\"><strong>nouvelle \u00e9tude<\/strong><\/a>, publi\u00e9e en ce mois de septembre, \u00e9tablit un constat \u00e9difiant. L\u2019\u00e9quipe internationale a tent\u00e9 d\u2019estimer plus&nbsp;<\/p>\n\n\n\n<p>pr\u00e9cis\u00e9ment la quantit\u00e9 de microplastiques dans nos oc\u00e9ans. Ces fragments sont presque invisibles. Leur taille peut varier de 5 millim\u00e8tres \u00e0 quelques centaines de nanom\u00e8tres. Pour y parvenir, les chercheurs ont analys\u00e9 et recoup\u00e9 plus de 8.200 \u00e9chantillons d\u2019eau pr\u00e9lev\u00e9s \u00e0 divers endroits de la plan\u00e8te. Initialement, ces donn\u00e9es devaient nourrir une base de donn\u00e9es publiques.<\/p>\n\n\n\n<p>R\u00e9sultat? Ces scientifiques estiment \u00e0 24.400 milliards la quantit\u00e9 de microplastiques dans nos oc\u00e9ans. Ces particules sont si nombreuses que leur poids total pourrait s\u2019\u00e9tablir entre 80.000 et 580.000 tonnes. C\u2019est bien plus que la pr\u00e9c\u00e9dente \u00e9valuation datant de 2015. Une \u00e9quipe de chercheurs avait alors \u00e9valu\u00e9 ce chiffre \u00e0 5.500 milliards de microplastiques, pesant entre 93.000 et 236.000 tonnes. Mais ce n\u2019est que la partie \u00e9merg\u00e9e de l\u2019iceberg. Selon les scientifiques, au moins 150 millions de tonnes de d\u00e9chets plastiques de toutes sortes se trouveraient dans les fonds des oc\u00e9ans.<\/p>\n\n\n\n<p>L\u2019\u00e9tendue de la catastrophe<\/p>\n\n\n\n<p>En six ans seulement, aurait-on r\u00e9ussi \u00e0 multiplier par cinq le nombre de microplastiques flottant dans nos oc\u00e9ans? La fabrication et consommation de plastique est certes toujours tr\u00e8s importante, avec 367 millions de tonnes de produits en 2020, selon Plastics Europe. Pour l\u2019association WWF,<em>&nbsp;\u201cla quantit\u00e9 accumul\u00e9e dans l\u2019oc\u00e9an pourrait doubler d\u2019ici 2030 et atteindre 300 millions de tonnes\u201d<\/em>. Pourtant, les \u00e9tudes montrent que la concentration de plastique a peu \u00e9volu\u00e9 ces derni\u00e8res ann\u00e9es pr\u00e8s des c\u00f4tes industrialis\u00e9es.<\/p>\n\n\n\n<p>Alors o\u00f9 va ce plastique ? \u201cLes d\u00e9chets g\u00e9n\u00e9r\u00e9s en Europe, en Asie ou aux \u00c9tats-Unis, sont v\u00e9hicul\u00e9s par les courants. Ils vont tr\u00e8s tr\u00e8s loin, et on les retrouve dans des endroits o\u00f9 il n\u2019y a pas de production de plastique comme les zones polaires, le fond des oc\u00e9ans ou les \u00eeles \u00e9loign\u00e9es\u201d&nbsp;explique \u00e0 Natura Sciences Fran\u00e7ois Galgani, chercheur \u00e0 l\u2019Institut fran\u00e7ais de recherche pour l\u2019exploitation de la mer (<a href=\"https:\/\/wwz.ifremer.fr\/\"><strong>Ifremer<\/strong><\/a>) et coauteur de l\u2019\u00e9tude. Durant leur parcours, ces d\u00e9chets vont se d\u00e9grader pour devenir des microplastiques et se disperser dans les oc\u00e9ans de la plan\u00e8te.<\/p>\n\n\n\n<p>Ce grand \u00e9cart entre les r\u00e9sultats de 2015 et ceux d\u2019aujourd\u2019hui s\u2019expliquent surtout par des diff\u00e9rences de m\u00e9thode de calcul.&nbsp;<em>\u201cPlus on en cherche, plus on en trouve! Aujourd\u2019hui, on a une couverture qui est plus large, et on s\u2019aper\u00e7oit que c\u2019est beaucoup plus important que ce qu\u2019on avait compt\u00e9 au pr\u00e9alable\u201d<\/em>, pr\u00e9cise Fran\u00e7ois Galgani. Et pour cause, compar\u00e9 \u00e0 2015, huit fois plus de donn\u00e9es \u00e9taient analysables, ce qui donne un r\u00e9sultat bien plus pr\u00e9cis. Cependant, malgr\u00e9 l\u2019augmentation du nombre d\u2019\u00e9chantillons compil\u00e9s, il manque toujours certains \u00e9l\u00e9ments majeurs : de l\u2019eau de l\u2019oc\u00e9an Indien occidental et de la mer de Chine m\u00e9ridionale. Or, les d\u00e9chets plastiques dans les oc\u00e9ans proviennent \u00e0 68% d\u2019Asie du Sud, du Sud-Est et de Chine.<\/p>\n\n\n\n<p>Petits fragments de microplastiques impliquent de grandes responsabilit\u00e9s<\/p>\n\n\n\n<p>Ces microplastiques, pouvant \u00eatre 70 fois plus petits que l\u2019\u00e9paisseur d\u2019un cheveu, sont pourtant susceptibles d\u2019avoir un fort impact sur la vie marine.&nbsp;<em>\u201cLes microplastiques peuvent avoir deux types d\u2019impacts majeurs: l\u2019ingestion par les animaux marins et le transport d\u2019esp\u00e8ces\u201d<\/em>&nbsp;pr\u00e9cise Fran\u00e7ois Galgani. Pour le premier danger, la majeure partie des esp\u00e8ces excr\u00e9teraient les microplastiques. Donc pour le chercheur,&nbsp;<em>\u201cle risque d\u2019avoir des microplastiques dans les produits de la mer que l\u2019on consomme est tr\u00e8s limit\u00e9\u201d<\/em>.<\/p>\n\n\n\n<p>En revanche, le transport d\u2019esp\u00e8ces est bien plus alarmant. Fran\u00e7ois Galgani souligne qu\u2019avec 24.400 milliards de microplastiques,&nbsp;\u201cchaque microplastique peut porter des bact\u00e9ries, des virus, des esp\u00e8ces unicellulaires, et on n\u2019a aucun recul sur ces micro-organismes. Or, on sait tr\u00e8s bien qu\u2019il y a des esp\u00e8ces \u00e0 risques, et des esp\u00e8ces pathog\u00e8nes. Cela risque de d\u00e9s\u00e9quilibrer les \u00e9cosyst\u00e8mes et la biodiversit\u00e9\u201d.<\/p>\n\n\n\n<p>Le P\u00e9rou et le Rwanda viennent de proposer un accord international pour lutter contre la pollution plastique dans le monde. Les 27 membres de l\u2019Union europ\u00e9enne le soutiennent d\u2019ores et d\u00e9j\u00e0. Il propose de cr\u00e9er un Comit\u00e9 intergouvernemental de n\u00e9gociation avec pour mandat d\u2019\u00e9tablir&nbsp;<em>\u201cun accord international juridiquement contraignant et bas\u00e9 sur une approche exhaustive pour pr\u00e9venir et r\u00e9duire la pollution environnementale\u201d<\/em>. Un accord qui prendrait aussi en compte les microplastiques et qui sera examin\u00e9 par l\u2019Assembl\u00e9e des Nations unies pour l\u2019environnement, qui doit se r\u00e9unir du 28 f\u00e9vrier au 2 mars \u00e0 Nairobi.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/bluetunisia.com\/wp-content\/uploads\/2021\/11\/dan-lewis-pNBEPzcvbCw-unsplash-905x1024.jpg\" alt=\"\" class=\"wp-image-5913\" \/><figcaption> <br>Photo by <a href=\"https:\/\/unsplash.com\/@fieldsofgold87?utm_source=unsplash&amp;utm_medium=referral&amp;utm_content=creditCopyText\">dan lewis<\/a> on <a href=\"https:\/\/unsplash.com\/s\/photos\/microplastic?utm_source=unsplash&amp;utm_medium=referral&amp;utm_content=creditCopyText\">Unsplash<\/a><em>  <\/em><br><em>Nous ing\u00e9rons 5 gr de micro plastique chaque semaine, l\u2019\u00e9quivalent d\u2019une carte de cr\u00e9dit<\/em>.<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Une nouvelle \u00e9tude \u00e9value \u00e0 24.000 milliards le nombre de microplastiques pr\u00e9sents \u00e0 la surface des oc\u00e9ans. Un chiffre d\u00e9j\u00e0 impressionnant, mais qui pourrait encore augmenter, multipliant les risques pour la biodiversit\u00e9 et pour notre environnement. Toujours plus de particules de plastique? Le Centre de recherches oc\u00e9aniques et atmosph\u00e9riques de l\u2019Universit\u00e9 de Kyushu (Japon) s\u2019est [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":5909,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"om_disable_all_campaigns":false,"pmpro_default_level":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[167],"tags":[],"coauthors":[],"class_list":["post-5906","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","pmpro-has-access"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>24.400 milliards de microplastiques d\u00e9rivent sur nos oc\u00e9ans ! - Blue Tunisia<\/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:\/\/bluetunisia.com\/fr\/24-400-milliards-de-microplastiques-derivent-sur-nos-oceans\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"24.400 milliards de microplastiques d\u00e9rivent sur nos oc\u00e9ans ! - Blue Tunisia\" \/>\n<meta property=\"og:description\" content=\"Une nouvelle \u00e9tude \u00e9value \u00e0 24.000 milliards le nombre de microplastiques pr\u00e9sents \u00e0 la surface des oc\u00e9ans. Un chiffre d\u00e9j\u00e0 impressionnant, mais qui pourrait encore augmenter, multipliant les risques pour la biodiversit\u00e9 et pour notre environnement. Toujours plus de particules de plastique? Le Centre de recherches oc\u00e9aniques et atmosph\u00e9riques de l\u2019Universit\u00e9 de Kyushu (Japon) s\u2019est [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/bluetunisia.com\/fr\/24-400-milliards-de-microplastiques-derivent-sur-nos-oceans\/\" \/>\n<meta property=\"og:site_name\" content=\"Blue Tunisia\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/Blue.Tunisia\/\" \/>\n<meta property=\"article:published_time\" content=\"2021-11-20T13:05:10+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-07-22T13:13:40+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/bluetunisia.com\/wp-content\/uploads\/2021\/11\/naja-bertolt-jensen-l9wysSCTz8o-unsplash-scaled-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1919\" \/>\n\t<meta property=\"og:image:height\" content=\"2560\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Mayssa Sandli\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@Blue___tn\" \/>\n<meta name=\"twitter:site\" content=\"@Blue___tn\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Mayssa Sandli\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n\t<meta name=\"twitter:label3\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data3\" content=\"Mayssa Sandli\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/bluetunisia.com\/fr\/24-400-milliards-de-microplastiques-derivent-sur-nos-oceans\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/bluetunisia.com\/fr\/24-400-milliards-de-microplastiques-derivent-sur-nos-oceans\/\"},\"author\":{\"name\":\"Mayssa Sandli\",\"@id\":\"https:\/\/bluetunisia.com\/fr\/#\/schema\/person\/04c0ab81b684ee0c966d895d1571d1a0\"},\"headline\":\"24.400 milliards de microplastiques d\u00e9rivent sur nos oc\u00e9ans !\",\"datePublished\":\"2021-11-20T13:05:10+00:00\",\"dateModified\":\"2025-07-22T13:13:40+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/bluetunisia.com\/fr\/24-400-milliards-de-microplastiques-derivent-sur-nos-oceans\/\"},\"wordCount\":907,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/bluetunisia.com\/fr\/#organization\"},\"image\":{\"@id\":\"https:\/\/bluetunisia.com\/fr\/24-400-milliards-de-microplastiques-derivent-sur-nos-oceans\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/bluetunisia.com\/wp-content\/uploads\/2021\/11\/naja-bertolt-jensen-l9wysSCTz8o-unsplash-scaled-1.jpg\",\"articleSection\":[\"News\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/bluetunisia.com\/fr\/24-400-milliards-de-microplastiques-derivent-sur-nos-oceans\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/bluetunisia.com\/fr\/24-400-milliards-de-microplastiques-derivent-sur-nos-oceans\/\",\"url\":\"https:\/\/bluetunisia.com\/fr\/24-400-milliards-de-microplastiques-derivent-sur-nos-oceans\/\",\"name\":\"24.400 milliards de microplastiques d\u00e9rivent sur nos oc\u00e9ans ! 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