{"id":9050,"date":"2015-11-09T00:00:15","date_gmt":"2015-11-08T23:00:15","guid":{"rendered":"http:\/\/www.laterredufutur.com\/accueil\/?p=9050"},"modified":"2015-11-05T17:47:57","modified_gmt":"2015-11-05T16:47:57","slug":"une-equipe-de-scientifiques-a-calcule-le-nombre-darbres-sur-terre","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/une-equipe-de-scientifiques-a-calcule-le-nombre-darbres-sur-terre\/","title":{"rendered":"Une \u00e9quipe de scientifiques a calcul\u00e9 le nombre d&rsquo;arbres sur Terre"},"content":{"rendered":"<div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"1\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n<p style=\"text-align: justify;\">Il s\u2019agit l\u00e0 du recensement des arbres de la plan\u00e8te le plus exact jamais effectu\u00e9, et ils sont au nombre de 3 000 milliards. Un nombre bien plus \u00e9lev\u00e9 que les estimations satellitaires (400 milliards) mais il demeure tout de m\u00eame en chute libre.<\/p>\n<p style=\"text-align: justify;\">Une \u00e9quipe internationale compos\u00e9e de 38 scientifiques vient de publier dans la revue Nature un recensement de tous les arbres pr\u00e9sents sur la plan\u00e8te Terre, le plus pr\u00e9cis jamais r\u00e9alis\u00e9. R\u00e9sultat, notre plan\u00e8te compte plus de 3 000 milliards d\u2019arbres, un chiffre bien plus \u00e9lev\u00e9 que les pr\u00e9c\u00e9dentes \u00e9tudes bas\u00e9es sur des images satellitaires, dont les estimations avan\u00e7aient un total de 400 milliards.<\/p>\n<p style=\"text-align: justify;\">Parmi tous ces arbres, une part de 43 % est situ\u00e9e dans les for\u00eats tropicales et subtropicales. Si l\u2019on fait un ratio par habitant de la plan\u00e8te, on obtient 422 arbres par personne, alors qu\u2019avec le d\u00e9compte satellitaire pr\u00e9c\u00e9dent, on n\u2019obtenait que 61 arbres par personne sur Terre. Le nombre est donc bien plus \u00e9lev\u00e9 que ce que l\u2019on pensait, mais il reste tout de m\u00eame en chute libre, les auteurs de l\u2019\u00e9tude rappelant notamment qu\u2019environ 15 milliards d\u2019arbres sont coup\u00e9s chaque ann\u00e9e, particuli\u00e8rement dans les zones tropicales, leur berceau. Les scientifiques rappellent \u00e9galement que depuis les d\u00e9buts de l\u2019agriculture, il y a 12 000 ans environ, le nombre d\u2019arbres sur Terre a chut\u00e9 de 46 %.<\/p><div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"2\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n\n<p style=\"text-align: justify;\">\u00ab Nous avons presque r\u00e9duit par deux le nombre d\u2019arbres sur la plan\u00e8te, ce qui a affect\u00e9 le climat et la sant\u00e9. Cette \u00e9tude souligne \u00e0 quel point d\u2019autres efforts sont n\u00e9cessaires si nous voulons restaurer des for\u00eats saines \u00e0 travers le monde \u00bb, d\u00e9clare Thomas Crowther, de l\u2019Universit\u00e9 de Yale (\u00c9tats Unis) et qui a men\u00e9 cette \u00e9quipe de scientifiques.<\/p>\n<p style=\"text-align: justify;\">Pour parvenir \u00e0 effectuer ce recensement avec pr\u00e9cision, l\u2019\u00e9quipe de Thomas Crowther a utilis\u00e9 des relev\u00e9s satellitaires qu\u2019ils ont combin\u00e9s \u00e0 429 775 relev\u00e9s effectu\u00e9s sur le terrain dans plus d\u2019une cinquantaine de pays. Les caract\u00e9ristiques environnementales des r\u00e9gions (temp\u00e9rature, \u00e9l\u00e9vation) leur ont permis de compl\u00e9ter ces estimations, et dans les r\u00e9gions o\u00f9 aucun relev\u00e9 n\u2019avait \u00e9t\u00e9 effectu\u00e9, ils ont utilis\u00e9 les tendances de densit\u00e9 dans des r\u00e9gions similaires pour faire des estimations.<\/p>\n<p style=\"text-align: justify;\">Ces estimations par r\u00e9gion pourront contribuer \u00e0 d\u00e9terminer la faune et la flore qui y vivent, ainsi que l\u2019influence de ces densit\u00e9s d\u2019arbres sur la quantit\u00e9 de dioxyde de carbone pr\u00e9sente dans l\u2019atmosph\u00e8re. Ceci va leur permettre d\u2019effectuer des pr\u00e9dictions sur l\u2019impact du changement climatique sur les for\u00eats.<\/p>\n<p style=\"text-align: justify;\"><a href=\"http:\/\/www.laterredufutur.com\/accueil\/\">TDF<\/a><\/p>\n<p style=\"text-align: justify;\">source :\u00a0<a href=\"http:\/\/www.buzznova.biz\/\" target=\"_blank\">http:\/\/www.buzznova.biz\/<\/a><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"9050\">(357)<\/p>\n<!--CusAds0-->\n<div style=\"font-size: 0px; height: 0px; line-height: 0px; margin: 0; padding: 0; clear: both;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Il s\u2019agit l\u00e0 du recensement des arbres de la plan\u00e8te le plus exact jamais effectu\u00e9, et ils sont au nombre&#8230;<\/p>\n","protected":false},"author":1,"featured_media":9051,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"ngg_post_thumbnail":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"Une \u00e9quipe de scientifiques a calcul\u00e9 le nombre d'arbres sur Terre @laterredufutur","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[27],"tags":[289,4198,98,307,314,1594,437,736,286,75,1795],"class_list":["post-9050","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ecologie","tag-arbres","tag-calcul","tag-environnement","tag-flore","tag-foret","tag-forets","tag-nature","tag-nombre","tag-oxygene","tag-terre","tag-verdure","wpcat-27-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/10\/foret.jpg?fit=1000%2C600&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-2lY","jetpack-related-posts":[{"id":15169,"url":"https:\/\/www.laterredufutur.com\/accueil\/lequipe-dun-chercheur-belge-decouvre-467-millions-dhectares-de-foret-passes-sous-les-radars\/","url_meta":{"origin":9050,"position":0},"title":"L&rsquo;\u00e9quipe d&rsquo;un chercheur belge d\u00e9couvre 467 millions d&rsquo;hectares de for\u00eat pass\u00e9s sous les radars","author":"Admin","date":"16 mai 2017","format":false,"excerpt":"Une importante d\u00e9couverte sur l'estimation de la surface foresti\u00e8re mondiale, qui prend toute son importance dans le contexte du r\u00e9chauffement climatique, vient d'\u00eatre r\u00e9alis\u00e9e par une \u00e9quipe de scientifiques dirig\u00e9e par un chercheur de l'ULB et de la FAO, le Belge Jean-Fran\u00e7ois Bastin. Des arbres qui n'\u00e9taient pas vus du\u2026","rel":"","context":"Dans &quot;Climat&quot;","block_context":{"text":"Climat","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/climat\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/05\/arbre-oasis.jpg?fit=1200%2C750&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/05\/arbre-oasis.jpg?fit=1200%2C750&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/05\/arbre-oasis.jpg?fit=1200%2C750&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/05\/arbre-oasis.jpg?fit=1200%2C750&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/05\/arbre-oasis.jpg?fit=1200%2C750&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":18499,"url":"https:\/\/www.laterredufutur.com\/accueil\/un-milliard-darbres-vont-etre-plantes-en-australie-dici-2050\/","url_meta":{"origin":9050,"position":1},"title":"Un milliard d&rsquo;arbres vont \u00eatre plant\u00e9s en Australie d&rsquo;ici 2050","author":"Admin","date":"19 mars 2019","format":false,"excerpt":"Le gouvernement australien a annonc\u00e9 le 15 f\u00e9vrier 2019 qu\u2019il comptait planter un milliard d\u2019arbres d\u2019ici 2050, pour atteindre les objectifs fix\u00e9s par l\u2019Accord de Paris sur le climat. Cette d\u00e9cision intervient apr\u00e8s les r\u00e9sul\u00adtats de l\u2019\u00e9tude d\u2019une \u00e9quipe de scien\u00adti\u00adfiques guid\u00e9e par le cher\u00adcheur Thomas Crow\u00ad\u00adther qui a estim\u00e9\u2026","rel":"","context":"Dans &quot;Ecologie&quot;","block_context":{"text":"Ecologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/ecologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/02\/arbres-australie.jpg?fit=1200%2C678&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/02\/arbres-australie.jpg?fit=1200%2C678&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/02\/arbres-australie.jpg?fit=1200%2C678&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/02\/arbres-australie.jpg?fit=1200%2C678&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/02\/arbres-australie.jpg?fit=1200%2C678&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":25359,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-plus-grande-foret-sauvage-du-monde-semble-se-reduire-comme-une-peau-de-chagrin\/","url_meta":{"origin":9050,"position":2},"title":"La plus grande for\u00eat sauvage du monde semble se r\u00e9duire comme une peau de chagrin","author":"Admin","date":"14 novembre 2023","format":false,"excerpt":"Les for\u00eats bor\u00e9ales de la Terre entourent les extr\u00e9mit\u00e9s septentrionales de notre plan\u00e8te, juste au sud de la toundra sans arbres de l'Arctique. Si la plan\u00e8te porte une calotte glaciaire arctique, les for\u00eats bor\u00e9ales sont un bandeau l\u00e2che enroul\u00e9 autour de ses oreilles, couvrant de larges portions de l'Alaska, du\u2026","rel":"","context":"Dans &quot;Ecologie&quot;","block_context":{"text":"Ecologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/ecologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/09\/foret-egypte-desert.jpg?fit=768%2C512&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/09\/foret-egypte-desert.jpg?fit=768%2C512&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/09\/foret-egypte-desert.jpg?fit=768%2C512&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/09\/foret-egypte-desert.jpg?fit=768%2C512&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":2634,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-foret-canadienne-sera-la-plus-grande-au-monde-dans-20-ans\/","url_meta":{"origin":9050,"position":3},"title":"La For\u00eat Canadienne sera la plus grande au monde dans 20 ans","author":"Admin","date":"30 d\u00e9cembre 2004","format":false,"excerpt":"45 % du territoire Canadien est forestier. Les for\u00eats du Canada font partie int\u00e9grante des cycles \u00e9cologiques \u00e0 l'\u00e9chelle plan\u00e9taire, car elles repr\u00e9sentent 10\u00a0p. 100 des for\u00eats du monde; de plus, environ 25\u00a0p. 100 des eaux douces de la plan\u00e8te proviennent de bassins versants situ\u00e9s au Canada. Enfin, les for\u00eats\u2026","rel":"","context":"Dans &quot;Ecologie&quot;","block_context":{"text":"Ecologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/ecologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/spaw\/images\/cwf02.jpeg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":2499,"url":"https:\/\/www.laterredufutur.com\/accueil\/un-drone-pourrait-planter-un-milliard-darbres-par-an\/","url_meta":{"origin":9050,"position":4},"title":"Un drone pourrait planter un milliard d\u2019arbres par an","author":"Admin","date":"12 mars 2015","format":false,"excerpt":"Planter un milliard d\u2019arbres gr\u00e2ce \u00e0 des drones : c'est le pari fou entrepris par Lauren Fletcher, un ex-ing\u00e9nieur de la NASA. C'est un drone capable d'abord de survoler un terrain, d'\u00e9valuer la nature du sol et de voir le meilleur emplacement pour planter. Ensuite, ce drone \"chef\" est suivi\u2026","rel":"","context":"Dans &quot;Solutions&quot;","block_context":{"text":"Solutions","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/solutions\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/wordpress\/wp-content\/uploads\/2015\/03\/laterredufutur.com_photos_drone_foret_bois.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":15540,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-terre-abrite-beaucoup-plus-de-forets-que-ce-quon-pensait\/","url_meta":{"origin":9050,"position":5},"title":"La Terre abrite beaucoup plus de for\u00eats que ce qu&rsquo;on pensait","author":"Admin","date":"3 ao\u00fbt 2017","format":false,"excerpt":"Une nouvelle analyse globale de la r\u00e9partition des for\u00eats sur le globe a permis de d\u00e9couvrir 467 millions d'hectares de for\u00eats pr\u00e9c\u00e9demment non d\u00e9clar\u00e9es. Il s'agit d'une superficie \u00e9quivalant \u00e0 60% de la taille de l'Australie. Cette d\u00e9couverte augmente d'environ 9% la quantit\u00e9 connue de couverture foresti\u00e8re mondiale et augmentera\u2026","rel":"","context":"Dans &quot;Divers&quot;","block_context":{"text":"Divers","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/divers\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/arbres-4.jpg?fit=900%2C506&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/arbres-4.jpg?fit=900%2C506&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/arbres-4.jpg?fit=900%2C506&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/arbres-4.jpg?fit=900%2C506&ssl=1&resize=700%2C400 2x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/9050","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/comments?post=9050"}],"version-history":[{"count":2,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/9050\/revisions"}],"predecessor-version":[{"id":9076,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/9050\/revisions\/9076"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media\/9051"}],"wp:attachment":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media?parent=9050"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/categories?post=9050"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/tags?post=9050"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}