{"id":7076,"date":"2021-04-21T18:04:48","date_gmt":"2021-04-21T22:04:48","guid":{"rendered":"https:\/\/ciraig.org\/?p=7076"},"modified":"2021-12-09T11:42:39","modified_gmt":"2021-12-09T16:42:39","slug":"cest-quoi-une-empreinte-carbone","status":"publish","type":"post","link":"https:\/\/ciraig.org\/index.php\/fr\/blogue\/cest-quoi-une-empreinte-carbone\/","title":{"rendered":"C&#8217;est quoi une empreinte carbone?"},"content":{"rendered":"\n<p><em>\u00ab L\u2019empreinte carbone ne prend visiblement pas en consid\u00e9ration la destruction de la biodiversit\u00e9. Est-ce le cas? \u00bb La r\u00e9ponse courte est oui et non ! Regardons \u00e7a de plus pr\u00e8s.<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Qu\u2019est-ce que repr\u00e9sente une empreinte carbone?<\/h2>\n\n\n\n<p id=\"4b64\">Le mot&nbsp;<em>empreinte<\/em>&nbsp;r\u00e9f\u00e8re \u00e0 la&nbsp;<strong>trace<\/strong>&nbsp;que nos activit\u00e9s humaines laissent sur l\u2019environnement en consid\u00e9rant leur cycle de vie. Le mot&nbsp;<em>carbone<\/em>&nbsp;indique que l\u2019on quantifie un enjeu environnemental sp\u00e9cifique qui sont les&nbsp;<strong>changements climatiques<\/strong>. L\u2019empreinte carbone est donc un&nbsp;<strong>indicateur de la<\/strong>&nbsp;<strong>contribution du cycle de vie de nos activit\u00e9s aux impacts environnementaux potentiels sur les changements climatiques<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">C\u2019est quoi le lien entre les GES et les changements climatiques ?<\/h2>\n\n\n\n<p id=\"2419\">Les changements climatiques actuels ont comme point de d\u00e9part les&nbsp;<strong>\u00e9missions de GES anthropog\u00e9niques<\/strong>, c\u2019est-\u00e0-dire dues aux activit\u00e9s humaines, qui sont principalement le CO2 \u00e9mis lors de la&nbsp;<strong>combustion des \u00e9nergies fossiles<\/strong>, et le CH4 et le protoxyde d\u2019azote provenant des&nbsp;<strong>activit\u00e9s agricoles<\/strong>. Les GES sont des substances qui contribuent \u00e0 retenir l\u2019\u00e9nergie solaire sous forme de chaleur proche de la surface de la Terre, le fameux \u00ab effet de serre \u00bb.<\/p>\n\n\n\n<p id=\"f59d\">Regardons de plus pr\u00e8s le lien entre les GES et les changements climatiques, c\u2019est-\u00e0-dire la chaine de cause \u00e0 effet des changements climatiques. Les \u00e9missions de GES de nos activit\u00e9s causent une&nbsp;<strong>augmentation de la concentration des GES<\/strong>&nbsp;dans l\u2019atmosph\u00e8re. Cela modifie le bilan radiatif de la Terre en provoquant une&nbsp;<strong>augmentation du for\u00e7age radiatif<\/strong>&nbsp;: en d\u2019autres termes, une partie du rayonnement infrarouge de la Terre, qui avant \u00e9tait \u00e9mis dans l\u2019espace, est renvoy\u00e9 vers la surface terrestre, provoquant en moyenne une&nbsp;<strong>augmentation des temp\u00e9ratures \u00e0 l\u2019\u00e9chelle mondiale<\/strong>. Cela engendre des&nbsp;<strong>modifications des syst\u00e8mes physiques<\/strong>&nbsp;: fonte des glaces, fortes pr\u00e9cipitations, s\u00e9cheresses, mont\u00e9e du niveau de la mer et \u00e9rosion des c\u00f4tes; qui entraine par la suite des&nbsp;<strong>changements sur les syst\u00e8mes biologiques<\/strong>&nbsp;(feux de for\u00eats, migration d\u2019esp\u00e8ces animales, perte de biodiversit\u00e9, etc.) mais aussi des&nbsp;<strong>changements sur les syst\u00e8mes humains<\/strong>&nbsp;(baisse des rendements agricoles qui aggrave les risques de malnutrition, prolif\u00e9ration de maladies, baisse de l\u2019esp\u00e9rance de vie, disparition de territoires, etc.). Ultimement, nos \u00e9missions de GES ont donc un impact potentiel sur les \u00e9cosyst\u00e8mes et sur les humains.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"0920\">Qu\u2019est-ce qu\u2019on mesure exactement dans une empreinte carbone ?<\/h2>\n\n\n\n<p id=\"9640\">G\u00e9n\u00e9ralement, une empreinte carbone est un indicateur exprim\u00e9 en kg de CO2 \u00e9quivalent. Elle ne repr\u00e9sente pas directement l\u2019impact sur la biodiversit\u00e9 ou sur la sant\u00e9 humaine mais exprime une contribution \u00e0 l\u2019<strong>augmentation du for\u00e7age radiatif.<\/strong>&nbsp;C\u2019est donc un indicateur d\u2019impact en amont de la chaine de cause \u00e0 effet des changements climatiques et qui&nbsp;<strong>approxime indirectement les impacts ultimes des changements climatiques sur \u00e9cosyst\u00e8mes et humains<\/strong>.<\/p>\n\n\n\n<p id=\"c962\">Donc pour r\u00e9pondre \u00e0 la question initiale, l\u2019impact des changements climatiques sur la biodiversit\u00e9 est donc refl\u00e9t\u00e9 indirectement dans l\u2019empreinte carbone en CO2-eq car plus on augmente le for\u00e7age radiatif plus on augmente le risque d\u2019impact sur la biodiversit\u00e9, mais il n\u2019est pas directement quantifi\u00e9.<\/p>\n\n\n\n<p id=\"dfa0\">Le CO2 n\u2019est pas le seul GES. Plus de 80 substances sont consid\u00e9r\u00e9es comme des GES par le GIEC : le m\u00e9thane, le protoxyde d\u2019azote, les hydrofluorocarbure (HFCs) ou les perfluorocarbures (PFC). La contribution \u00e0 l\u2019augmentation du for\u00e7age radiatif de chaque GES&nbsp;<strong>va d\u00e9pendre de sa capacit\u00e9 \u00e0 absorber la chaleur et de sa dur\u00e9e de vie dans l\u2019atmosph\u00e8re<\/strong>. Chaque GES poss\u00e8de donc son propre&nbsp;<strong>Potentiel de R\u00e9chauffement Global<\/strong>&nbsp;(PRG) qui repr\u00e9sente son potentiel de r\u00e9chauffement pendant plusieurs ann\u00e9es compar\u00e9 \u00e0 celui du CO2, d\u2019o\u00f9 l\u2019unit\u00e9 en CO2eq. Sur 100 ans, un kg de m\u00e9thane \u00e9quivaut \u00e0 28kg de CO2 et un kg l\u2019hexafluorure de soufre 23 500kg CO2.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"0467\">Comment fait-on concr\u00e8tement pour calculer une empreinte carbone?<\/h3>\n\n\n\n<p id=\"c2ca\">M\u00eame si le calcul de l\u2019empreinte carbone reste sujet \u00e0 d\u00e9bat, il se base g\u00e9n\u00e9ralement sur une&nbsp;<strong>approche cycle de vie<\/strong>. Mettons qu\u2019on veuille calculer l\u2019empreinte carbone d\u2019un trajet en auto. La premi\u00e8re \u00e9tape consiste \u00e0 faire l\u2019inventaire des \u00e9missions de GES sur le cycle de vie du trajet en auto, c\u2019est-\u00e0-dire les&nbsp;<strong>\u00e9missions directes<\/strong>&nbsp;lors de la combustion de l\u2019essence dans le moteur, mais aussi toutes les&nbsp;<strong>\u00e9missions indirectes<\/strong>: la production de l\u2019auto, de la route, du carburant, la fin de vie de l\u2019auto, qui sont g\u00e9n\u00e9ralement estim\u00e9es gr\u00e2ce \u00e0 des bases de donn\u00e9es. Pour calculer l\u2019empreinte carbone, on va donc multiplier toutes les \u00e9missions de GES sur le cycle de vie par leur PRG respectifs puis agr\u00e9ger le tout en un&nbsp;<strong>r\u00e9sultat unique en CO2 \u00e9quivalent<\/strong>. Ainsi on peut calculer l\u2019empreinte carbone d\u2019un produit, d\u2019un territoire, d\u2019une entreprise, d\u2019un individu, etc.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"fc59\">Existe-t-il d\u2019autres indicateurs pour mesurer l\u2019impact des changements climatiques dus aux \u00e9missions de GES ?<\/h3>\n\n\n\n<p id=\"5956\">Il existe d\u2019autres indicateurs dans la litt\u00e9rature scientifique qui se trouvent plus en aval sur la chaine de cause \u00e0 effet. Par exemple, un autre indicateur permet d\u2019estimer&nbsp;<strong>le changement potentiel de temp\u00e9rature au bout d\u2019une certaine p\u00e9riode due aux \u00e9missions de GES<\/strong>, en prenant non seulement en compte l\u2019augmentation du for\u00e7age radiatif comme pour le PRG mais aussi la r\u00e9ponse dynamique du climat \u00e0 ce for\u00e7age radiatif, et notamment l\u2019absorption d\u2019une partie de la chaleur additionnelle par les oc\u00e9ans.<\/p>\n\n\n\n<p id=\"c274\">Par ailleurs, d\u2019autres indicateurs vont m\u00eame jusqu\u2019\u00e0&nbsp;<strong>estimer l\u2019impact des \u00e9missions de GES sur la qualit\u00e9 des \u00e9cosyst\u00e8mes ou sur la sant\u00e9 humaine<\/strong>&nbsp;mais la mod\u00e9lisation en arri\u00e8re de ces indicateurs est encore assez incertaine \u00e0 cause de la complexit\u00e9 des interactions entre le climat, les \u00e9cosyst\u00e8mes et l\u2019\u00e9conomie.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1258\">Est-il suffisant de mesurer l\u2019empreinte carbone si on veut connaitre nos impacts sur l\u2019environnement ?<\/h3>\n\n\n\n<p id=\"538d\">Les changements climatiques sont un&nbsp;<strong>enjeu environnemental majeur<\/strong>&nbsp;auquel nous faisons face. C\u2019est l\u2019enjeu environnemental prioritaire pour de nombreux gouvernements et entreprises. En ce sens, l\u2019empreinte carbone est un outil utile pour guider la r\u00e9duction des \u00e9missions de GES.<\/p>\n\n\n\n<p id=\"feb9\">Toutefois,&nbsp;<strong>les enjeux environnementaux ne se limitent pas seulement aux changements climatiques<\/strong>. Nos activit\u00e9s causent d\u2019autres impacts environnementaux comme l\u2019acidification, l\u2019eutrophisation, la toxicit\u00e9 humaine, l\u2019\u00e9cotoxicit\u00e9 ou la rar\u00e9faction des ressources qui n\u2019ont rien \u00e0 voir avec les changements climatiques. Ultimement, l\u2019environnement rend toutes sortes de services que l\u2019on souhaite prot\u00e9ger comme la sant\u00e9 humaine, la qualit\u00e9 des \u00e9cosyst\u00e8mes, l\u2019acc\u00e8s aux ressources naturelles et aux services \u00e9cosyst\u00e9miques. D\u2019ailleurs, ce sont les impacts des changements climatiques sur ces diff\u00e9rentes aires de protection que l\u2019on cherche \u00e0 limiter lorsqu\u2019on r\u00e9duit nos \u00e9missions de GES, et non les changements climatiques en tant que tels. Quand on veut agir pour l\u2019environnement, il faut donc s\u2019int\u00e9resser \u00e0 tous les impacts potentiels sur l\u2019environnement pour avoir un portrait exhaustif et&nbsp;<strong>\u00e9viter le d\u00e9placement d\u2019impact d\u2019un enjeu environnemental vers un autre<\/strong>. Par exemple, utiliser du bois pour le chauffage a moins d\u2019impact sur les changements climatiques qu\u2019utiliser du p\u00e9trole mais \u00e9met plus de particules fines qui ont un impact sur la sant\u00e9 humaine, notamment en ville.<\/p>\n\n\n\n<p id=\"f637\">Finalement, l\u2019empreinte environnementale \u00e7a n\u2019existe pas vraiment. Si on veut comprendre les impacts environnementaux d\u2019un produit, il faut s\u2019int\u00e9resser \u00e0 diff\u00e9rents indicateurs d\u2019impacts environnementaux dont l\u2019empreinte carbone fait partie.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"b2fd\">Empreinte carbone, empreinte \u00e9cologique, empreinte eau\u2026 c\u2019est quoi la diff\u00e9rence ?<\/h2>\n\n\n\n<p id=\"2e33\">Il existe une multitude d\u2019indicateurs qui quantifient tous des enjeux environnementaux diff\u00e9rents. L\u2019empreinte \u00e9cologique est un indicateur souvent utilis\u00e9 dans les calculateurs d\u2019empreinte individuelle, quand on vous dit qu\u2019il faudrait 3 plan\u00e8tes si tout le monde vivait comme vous. Contrairement \u00e0 l\u2019empreinte carbone qui est un indicateur d\u2019impact sur les changements climatiques,&nbsp;<strong>l\u2019empreinte \u00e9cologique est un indicateur de disponibilit\u00e9 de ressource<\/strong>. Il mesure la quantit\u00e9 de ressources renouvelables n\u00e9cessaires pour permettre notre mode de vie et le compare \u00e0 la capacit\u00e9 de notre plan\u00e8te \u00e0 r\u00e9g\u00e9n\u00e9rer nos d\u00e9chets en ressource. L\u2019empreinte eau estime les quantit\u00e9s d\u2019eau utilis\u00e9es sur le cycle de vie d\u2019un produit, et \u00e9ventuellement les impacts de l\u2019utilisation de cette eau sur diff\u00e9rents enjeux environnementaux.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Si vous souhaitez comprendre, quantifier et valoriser l\u2019empreinte carbone, suivez la&nbsp;<a href=\"https:\/\/ciraig.org\/index.php\/fr\/training\/comprendre-quantifier-et-valoriser-lempreinte-carbone\/\">formation du CIRAIG<\/a>&nbsp;ou faites une demande pour&nbsp;<a href=\"https:\/\/ciraig.org\/index.php\/fr\/training\/comprendre-quantifier-et-valoriser-lempreinte-carbone\/\">une formation sur mesure.<\/a><\/p><\/blockquote>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p> <\/p>\n\n\n\n<p id=\"d784\"><em>Ce texte est tir\u00e9 de la chronique de\u00a0<a href=\"https:\/\/ciraig.org\/index.php\/fr\/team\/laure-patouillard-2\/\">Laure Patouillard<\/a>\u00a0\u00e0 l\u2019\u00e9mission\u00a0<a href=\"https:\/\/ici.radio-canada.ca\/ohdio\/premiere\/emissions\/moteur-de-recherche\/episodes\/454192\/rattrapage-du-mardi-4-fevrier-2020\/5\">Moteur de recherche Radio-Canada le 4 f\u00e9vrier 2020<\/a>.<\/em><\/p>\n\n\n\n<p> <\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p id=\"d31d\"><strong>Bibliographie<\/strong><\/p>\n\n\n\n<p id=\"e798\">IPCC. (2014). Climate Change 2014 Synthesis Report.<\/p>\n\n\n\n<p id=\"75dd\">Wright, L. A., Kemp, S., &amp; Williams, I. (2011). \u2018Carbon footprinting\u2019: towards a universally accepted definition. Carbon Management, 2(1), 61\u201372.&nbsp;<a href=\"https:\/\/doi.org\/10.4155\/cmt.10.39\">https:\/\/doi.org\/10.4155\/cmt.10.39<\/a><\/p>\n\n\n\n<p id=\"2e1c\">Verones, F., Bare, J., Bulle, C., Frischknecht, R., Hauschild, M., Hellweg, S., \u2026 Fantke, P. (2017). LCIA framework and cross-cutting issues guidance within the UNEP-SETAC Life Cycle Initiative. Journal of Cleaner Production, 161, 957\u2013967.&nbsp;<a href=\"https:\/\/doi.org\/10.1016\/j.jclepro.2017.05.206\">https:\/\/doi.org\/10.1016\/j.jclepro.2017.05.206<\/a><\/p>\n\n\n\n<p id=\"1c5d\">Bulle, C., Margni, M., Patouillard, L., Boulay, A., Bourgault, G., De Bruille, V., \u2026 Jolliet, O. (2019). IMPACT World+: a globally regionalized life cycle impact assessment method. The International Journal of Life Cycle Assessment, 24(9), 1653\u20131674.&nbsp;<a href=\"https:\/\/doi.org\/10.1007\/s11367-019-01583-0\">https:\/\/doi.org\/10.1007\/s11367-019-01583-0<\/a><\/p>\n\n\n\n<p id=\"44aa\">Mart\u00ednez-Arce, A., Chargoy, J., Puerto, M., Rojas, D., &amp; Suppen, N. (2018). Water Footprint (ISO 14046) in Latin America, State of the Art and Recommendations for Assessment and Communication. Environments, 5(11), 114.&nbsp;<a href=\"https:\/\/doi.org\/10.3390\/environments5110114\">https:\/\/doi.org\/10.3390\/environments5110114<\/a><\/p>\n\n\n\n<p id=\"0d4b\">Ridoutt, B., Fantke, P., Pfister, S., Bare, J., Boulay, A.-M., Cherubini, F., \u2026 Wiedmann, T. (2015). Making Sense of the Minefield of Footprint Indicators. Environmental Science &amp; Technology, 49(5), 2601\u20132603.&nbsp;<a href=\"https:\/\/doi.org\/10.1021\/acs.est.5b00163.\">https:\/\/doi.org\/10.1021\/acs.est.5b00163.<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>L\u2019empreinte carbone est un indicateur de la contribution du cycle de vie de nos activit\u00e9s aux impacts sur les changements climatiques<\/p>\n","protected":false},"author":1,"featured_media":4000,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[850],"tags":[],"class_list":["post-7076","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blogue"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>C&#039;est quoi une empreinte carbone? - CIRAIG<\/title>\n<meta name=\"description\" content=\"L\u2019empreinte carbone est un indicateur de la contribution du cycle de vie de nos activit\u00e9s aux impacts sur les changements climatiques\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ciraig.org\/index.php\/fr\/blogue\/cest-quoi-une-empreinte-carbone\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C&#039;est quoi une empreinte carbone? 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