{"id":5353,"date":"2011-11-30T17:08:11","date_gmt":"2011-11-30T17:08:11","guid":{"rendered":"http:\/\/www.forestsnews.org\/?p=5353"},"modified":"2015-09-30T16:17:21","modified_gmt":"2015-09-30T09:17:21","slug":"la-dette-carbone-de-certains-biocarburants-prise-en-compte-dans-le-debat-sur-la-durabilite-indique-une-nouvelle-etude","status":"publish","type":"post","link":"https:\/\/www.forestsnews.org\/fr\/5353\/la-dette-carbone-de-certains-biocarburants-prise-en-compte-dans-le-debat-sur-la-durabilite-indique-une-nouvelle-etude","title":{"rendered":"La \u00ab\u00a0dette carbone\u00a0\u00bb de certains biocarburants prise en compte dans le d\u00e9bat sur la durabilit\u00e9, indique une nouvelle \u00e9tude"},"content":{"rendered":"<figure id=\"attachment_5354\" aria-describedby=\"caption-attachment-5354\" style=\"width: 300px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/www.forestsnews.org\/5353\/la-dette-carbone-de-certains-biocarburants-prise-en-compte-dans-le-debat-sur-la-durabilite-indique-une-nouvelle-etude\/soybean-2\/\" rel=\"attachment wp-att-5354\"><img loading=\"lazy\" decoding=\"async\" class=\"size-thumbnail wp-image-5354\" title=\"La dette carbone des cultures de soja est la moins longue \u00e0 rembourser. Cr\u00e9dit photo : Ryan\/flickr.\" src=\"\/\/www.forestsnews.org\/wp-content\/uploads\/2011\/11\/soybean1-300x225.jpg\" alt=\"\" width=\"300\" height=\"225\" \/><\/a><figcaption id=\"caption-attachment-5354\" class=\"wp-caption-text\">La dette carbone des cultures de soja est la moins longue \u00e0 rembourser. Cr\u00e9dit photo : Ryan\/flickr.<\/figcaption><\/figure>\n<p>DURBAN, Afrique du Sud (30 novembre 2011)_Bien que les biocarburants soient pr\u00e9sent\u00e9s comme une solution verte aux combustibles fossiles, une nouvelle \u00e9tude du Centre de recherche foresti\u00e8re internationale montre qu\u2019il faudra parfois des d\u00e9cennies, voire des si\u00e8cles, pour mettre un terme aux \u00e9missions de carbone li\u00e9es \u00e0 la conversion des terres pour la production de biodiesel, ce qui soul\u00e8ve de s\u00e9rieuses questions sur le caract\u00e8re durable de celui-ci. Cette importante diff\u00e9rence de temps tient au type de terre convertie et \u00e0 la productivit\u00e9 de la mati\u00e8re premi\u00e8re cultiv\u00e9e.<\/p>\n<p>Des travaux publi\u00e9s par le CIFOR, entre autres, indiquent qu\u2019il est n\u00e9cessaire qu\u2019une \u00ab analyse du cycle de vie complet \u00bb, qui tienne compte de la dette carbone li\u00e9e au changement d\u2019utilisation des terres, devienne une habitude durant l\u2019\u00e9valuation des avantages environnementaux de l\u2019utilisation des biocarburants.<\/p>\n<p>\u00ab La mani\u00e8re de produire les biocarburants et les terres que l\u2019on utilise \u00e0 cet effet sont tr\u00e8s importants pour savoir si l\u2019on va obtenir des b\u00e9n\u00e9fices climatiques \u00bb, explique Louis Verchot, chercheur au CIFOR et coauteur d\u2019un article intitul\u00e9 <span style=\"text-decoration: underline;\"><a href=\"http:\/\/www.ecologyandsociety.org\/issues\/view.php?sf=68\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">Implications of Biodiesel\u2010Induced Land\u2010Use Changes for CO2 Emissions: Case Studies in Tropical America, Africa, and Southeast Asia<\/a><\/span>, publi\u00e9 dans un num\u00e9ro sp\u00e9cial de <em>Ecology and Society<\/em>.<\/p>\n<p>\u00ab Les biocarburants issus de la conversion d\u2019\u00e9cosyst\u00e8mes naturels ne seront jamais efficaces en termes d\u2019\u00e9missions. Cette \u00e9tude pr\u00e9conise un am\u00e9nagement du territoire appropri\u00e9 et une sensibilisation au fait que tout ce qui est entrepris au nom de l\u2019atmosph\u00e8re pourrait avoir des cons\u00e9quences impr\u00e9vues, \u00e0 moins de prendre en compte l\u2019ensemble du syst\u00e8me de production. \u00bb<\/p>\n<p>Les fluctuations des prix du p\u00e9trole et les craintes accrues relatives au changement climatique ont conduit \u00e0 un engagement renouvel\u00e9 en faveur des \u00e9nergies renouvelables avec, ces derni\u00e8res ann\u00e9es, une augmentation de la demande en biocarburants, comme ceux produits \u00e0 partir d\u2019huile de palme, de jatropha et de soja.<\/p>\n<p>Toutefois, malgr\u00e9 leur potentiel d\u2019att\u00e9nuation du climat, les biocarburants re\u00e7oivent une attention de plus en plus n\u00e9gative car l\u2019augmentation de leur production entra\u00eene souvent la d\u00e9forestation, des cons\u00e9quences n\u00e9gatives pour les utilisateurs coutumiers de terres, par exemple la perte de droits fonciers et de droits au travail, des menaces \u00e0 la s\u00e9curit\u00e9 alimentaire et d\u2019importantes \u00e9missions de carbone li\u00e9es au changement d\u2019affectation des terres.<\/p>\n<p>Afin de quantifier les effets atmosph\u00e9riques des changements d\u2019utilisation des terres pour produire des biocarburants, les chercheurs du CIFOR ont examin\u00e9 des \u00e9tudes de cas r\u00e9elles concernant la production de trois mati\u00e8res premi\u00e8res destin\u00e9es \u00e0 la fabrication de biodiesel et \u00e0 des usages multiples dans des sites en Asie, en Afrique et en Am\u00e9rique latine. Ils ont calcul\u00e9 les \u00e9missions issues des changements directs d\u2019affectation des terres (d\u00e9frichement pour cr\u00e9er des champs) et \u00e9valu\u00e9 les fourchettes possibles afin d\u2019anticiper les changements indirects d\u2019affectation des terres (lorsque la production de biocarburants r\u00e9duit d\u2019autres activit\u00e9s agricoles dans les \u00e9cosyst\u00e8mes naturels).<\/p>\n<p>Ils ont consid\u00e9r\u00e9 ces \u00e9missions comme la \u00ab dette carbone \u00bb cr\u00e9\u00e9e dans la cha\u00eene de production des biocarburants, une dette qui doit d\u2019abord \u00eatre rembours\u00e9e, en r\u00e9duisant l\u2019utilisation des combustibles fossiles, avant de pouvoir observer des b\u00e9n\u00e9fices nets pour l\u2019atmosph\u00e8re. Les chercheurs du CIFOR ont ensuite calcul\u00e9 le temps qu\u2019il faudrait pour payer la dette carbone de chaque syst\u00e8me \u00e9tudi\u00e9.<\/p>\n<p>Dans la plupart des cas, les travaux ont montr\u00e9 que d\u2019importantes dettes carbone \u00e9taient cr\u00e9\u00e9es par la culture de mati\u00e8res premi\u00e8res \u00e0 usages multiples ou destin\u00e9es au biodiesel uniquement, et qu\u2019il faudrait entre plusieurs d\u00e9cennies et plusieurs si\u00e8cles pour les rembourser. La meilleure production \u00e9tudi\u00e9e fut celle de soja, pour laquelle la dur\u00e9e de remboursement \u00e9tait parfois inf\u00e9rieure \u00e0 30 ans.<\/p>\n<p>L\u2019id\u00e9e de rembourser la dette carbone n\u2019est pas nouvelle pour les biocarburants. Cette \u00e9tude constitue actuellement la meilleure tentative de quantification de cette dette dans les tropiques et d\u2019estimation des dur\u00e9es de remboursement pour les syst\u00e8mes de production dans le monde. Le point fort de ces travaux r\u00e9side dans les comparaisons effectu\u00e9es entre diff\u00e9rentes mati\u00e8res premi\u00e8res et diff\u00e9rentes situations.<\/p>\n<p>\u00ab Le message \u00e0 retenir \u00bb, affirme Verchot, \u00ab n\u2019est pas que les biocarburants sont mauvais pour l\u2019atmosph\u00e8re. Les r\u00e9sultats montrent plut\u00f4t que d\u2019importantes consid\u00e9rations doivent \u00eatre prises en compte pour rendre les biocarburants durables. \u00bb<\/p>\n<p>Ces \u00e9tudes doivent aider les d\u00e9cideurs, tant dans les pays producteurs que dans les pays consommateurs, \u00e0 comprendre ce qui doit \u00eatre fait pour mieux guider et r\u00e9glementer l\u2019industrie, afin qu\u2019elle atteigne les principaux objectifs politiques, indique Laura German, r\u00e9dactrice en chef du num\u00e9ro sp\u00e9cial.<\/p>\n<p>\u00ab Cette s\u00e9rie d\u2019articles sugg\u00e8re que ni les moyens de subsistance ruraux, ni les b\u00e9n\u00e9fices en termes d\u2019att\u00e9nuation du climat ne peuvent \u00eatre pr\u00e9dits, ce qui souligne la n\u00e9cessit\u00e9 d\u2019une action plus proactive de la part des gouvernements des pays producteurs et consommateurs, de l\u2019industrie et de la soci\u00e9t\u00e9 civile, afin d\u2019orienter le secteur dans une voie plus durable et plus \u00e9quitable. \u00bb<\/p>\n<p><em>Les impacts et implications de l\u2019essor des biocarburants sur les for\u00eats seront d\u00e9battus lors d\u2019un \u00e9v\u00e9nement organis\u00e9 par le CIFOR durant le symposium sur le commerce et le changement climatique \u00e0 Durban, en marge de la Conf\u00e9rence des Nations Unies sur les changements climatiques (COP 17) qui aura lieu la semaine prochaine \u00e0 Durban (Afrique du Sud). <span style=\"text-decoration: underline;\"><a href=\"\/\/www.cifor.org\/events\/biofuel-development-and-forests.html\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">S\u2019inscrire<\/a><\/span>.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>DURBAN, Afrique du Sud (30 novembre 2011)_Bien que les biocarburants soient pr\u00e9sent\u00e9s comme une solution verte aux combustibles fossiles, une nouvelle \u00e9tude du Centre de recherche foresti\u00e8re internationale montre qu\u2019il faudra parfois des d\u00e9cennies, voire des si\u00e8cles, pour mettre un terme aux \u00e9missions de carbone li\u00e9es \u00e0 la conversion des terres pour la production de [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[462,180,184],"tags":[],"language":[2170],"location":[],"tag-bahasa":[],"tag-espanol":[],"tag-francais":[],"type-espanol":[],"type-bahasa":[],"type-english":[],"type-francais":[],"coauthors":[199],"class_list":["post-5353","post","type-post","status-publish","format-standard","hentry","category-climate-change-energy","category-mitigating-climate-change","category-value-chains-finance","language-francais"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.4 (Yoast SEO v28.4) - 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