{"id":2865,"date":"2021-01-11T09:54:03","date_gmt":"2021-01-11T08:54:03","guid":{"rendered":"https:\/\/sceaux-lagazette.fr\/?p=2865"},"modified":"2022-10-17T19:08:29","modified_gmt":"2022-10-17T17:08:29","slug":"bilan-carbone-de-sceaux","status":"publish","type":"post","link":"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/01\/11\/bilan-carbone-de-sceaux\/","title":{"rendered":"Bilan carbone de Sceaux"},"content":{"rendered":"\n<p>Dans le cadre de sa r\u00e9flexion sur les transitions, la ville de Sceaux a pr\u00e9vu de r\u00e9aliser un bilan carbone de l\u2019ensemble de son territoire. Elle a mis \u00e0 disposition des membres du comit\u00e9 consultatif des transitions (CCT) celui d\u00e9j\u00e0 r\u00e9alis\u00e9 en 2008 (en fait le rapport de synth\u00e8se). Que nous indiquait cette \u00e9tude, r\u00e9alis\u00e9e juste apr\u00e8s le Grenelle de l\u2019environnement&nbsp;?<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">La m\u00e9thode utilis\u00e9e<\/h2>\n\n\n\n<p>L\u2019\u00e9tude s\u2019est efforc\u00e9e, domaine par domaine, d\u2019estimer les \u00e9missions sur le territoire de la ville. Dans de nombreux cas, faute de plus d\u2019informations, l\u2019estimation se fait \u00e0 partir des donn\u00e9es moyennes pour les Fran\u00e7ais. L\u2019objectif affich\u00e9 est d\u00e9j\u00e0 d\u2019avoir une id\u00e9e des ordres de grandeur, ce qui ne parait pas anormal. Dans certains cas, l\u2019approche est un peu plus fine. Par exemple, pour l\u2019\u00e9valuation des \u00e9missions li\u00e9es au logement, l\u2019\u00e9tude distingue les maisons et les appartements, leur anciennet\u00e9 (avant et apr\u00e8s 1975, date des premi\u00e8res normes d\u2019isolation en France) et la source d\u2019\u00e9nergie (fuel, gaz ou \u00e9lectricit\u00e9). L\u2019\u00e9tude s\u2019appuie aussi sur une \u00e9tude de la fr\u00e9quentation des commerces de Sceaux faite peu auparavant. Une attention particuli\u00e8re a \u00e9t\u00e9 accord\u00e9e aux activit\u00e9s d\u00e9pendant de la ville, o\u00f9 il \u00e9tait probablement possible d\u2019obtenir plus d\u2019informations.<\/p>\n\n\n\n<p>Attention, l\u2019\u00e9tude compte les \u00e9missions en tonnes \u00e9quivalent carbone, alors qu\u2019aujourd\u2019hui, on pratique plut\u00f4t en tonnes de CO2.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Installations d\u00e9pendant de la ville<\/h2>\n\n\n\n<p>L\u2019\u00e9tude a distingu\u00e9 ce qu\u2019elle appelle l\u2019administration g\u00e9n\u00e9rale de la ville, l\u2019enseignement, et les logements de l\u2019OPH. Les \u00e9missions sont estim\u00e9es \u00e0 2400 Tonnes \u00e9quivalent carbone (r\u00e9parties entre respectivement 450 T, 600 T et 1400t). Il est pr\u00e9cis\u00e9 que cette estimation a fait l\u2019objet d\u2019un rapport sp\u00e9cial qu\u2019il serait bien utile de pouvoir consulter.&nbsp; Il en est de m\u00eame pour le tableau Excel joint au rapport qui d\u00e9taille tous les calculs.<\/p>\n\n\n\n<p>M\u00eame si l\u2019\u00e9quipe municipale ne peut se d\u00e9sint\u00e9resser de ce qui se passe sur son territoire, sa responsabilit\u00e9 porte avant tout sur ce qui d\u00e9pend directement d\u2019elle. Par exemple, si elle ne se pr\u00e9occupe pas de l\u2019isolation des b\u00e2timents occup\u00e9s par les services municipaux ou des \u00e9coles primaires, personne ne le fera \u00e0 sa place. Il s\u2019agit bien d\u2019une action prioritaire. On ne peut qu\u2019esp\u00e9rer en savoir plus avec la publication du rapport sp\u00e9cial.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Bilan du territoire<\/h2>\n\n\n\n<p>En synth\u00e8se, les pr\u00e8s de 45&nbsp;000 TEC g\u00e9n\u00e9r\u00e9es par l\u2019activit\u00e9 du territoire se r\u00e9partissent de la mani\u00e8re suivante&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Transports de personnes en voiture&nbsp;: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 10&nbsp;000 Tec<\/li><li>R\u00e9sidentiel&nbsp;: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;9 300 Tec<\/li><li>Transports de personne, transport collectif&nbsp;: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;7 800 Tec<\/li><li>Fret&nbsp;: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;6 200 Tec<\/li><li>Tertiaire&nbsp;: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;3 800 Tec<\/li><li>Fabrication des futurs d\u00e9chets&nbsp;: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;2 100 TEC<\/li><li>Proc\u00e9d\u00e9s industriels&nbsp;: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;2 100 Tec<\/li><li>Construction et voirie&nbsp;: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;1 000 Tec<\/li><li>Fin de vie des d\u00e9chets&nbsp;: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;500 TEC<\/li><\/ul>\n\n\n\n<p>Parmi ces \u00e9missions, il y en a qui demandent des \u00e9valuations complexes, en prenant en compte l\u2019ensemble du cycle de vie d\u2019un produit. Pour aller jusqu\u2019au bout d\u2019une r\u00e9flexion sur les moyens de r\u00e9duire les \u00e9missions, il ne suffit pas de prendre en compte l\u2019essence consomm\u00e9e par notre voiture, mais aussi l\u2019\u00e9nergie pour fabriquer l\u2019acier qui a servi \u00e0 la production de la voiture ou celle qui a permis de transporter cet acier jusqu\u2019\u00e0 l\u2019atelier t\u00f4lerie du fabricant.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Bilan personnel<\/h2>\n\n\n\n<p>Ce que montre le bilan carbone ci-dessus, c\u2019est qu\u2019une part importante(plus de la moiti\u00e9) des \u00e9missions qui d\u00e9pendent des m\u00e9nages est tr\u00e8s facile \u00e0 calculer. Avant m\u00eame de se demander si on \u00e9conomisera du carbone en achetant tel produit plut\u00f4t qu\u2019un autre ou en vidant sa boite mail, on peut regarder trois donn\u00e9es qui ne d\u00e9pendent de personne d\u2019autre&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Com<span class=\"has-inline-color has-very-dark-gray-color\">bien j&rsquo;ai consomm\u00e9 de carburant fossile pour mon<\/span><a> <\/a>(ou mes) v\u00e9hicule<\/li><li>Combien j\u2019ai consomm\u00e9 de carburant fossile pour mon logement<\/li><li>Combien j\u2019ai fait de km en avion<\/li><\/ul>\n\n\n\n<p>La production d\u2019\u00e9lectricit\u00e9 \u00e9tant particuli\u00e8rement peu carbon\u00e9e en France, on ne prend pas ici en compte les consommations d\u2019\u00e9lectricit\u00e9.<\/p>\n\n\n\n<p>Quelques donn\u00e9es&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>La combustion d\u2019un litre d\u2019essence produit 2,4 kg de CO2<\/li><li>La combustion d\u2019un litre de di\u00e9sel produit 2,6 kg de CO2<\/li><li>La combustion d\u2019un litre de fuel\/mazout produit 2,6 kg de CO2<\/li><li>La combustion d\u2019un kWh PCI de gaz naturel produit 0,187 kg de CO2<\/li><li>C\u2019est plus compliqu\u00e9 pour les voyages en avion&nbsp;: l\u2019effet d\u00e9pend en particulier du nombre de passagers et de la distance parcourue, et les \u00e9tudes montrent que d\u2019autres effets que l\u2019\u00e9mission du seul CO2 sont \u00e0 prendre en compte. Une premi\u00e8re approche peut consister \u00e0 compter 0,2 kg de C02e par km passager (<a href=\"https:\/\/fr.wikipedia.org\/wiki\/Impact_climatique_du_transport_a%C3%A9rien\" target=\"_blank\" rel=\"noreferrer noopener\">tableau plus complet ici<\/a>)<\/li><\/ul>\n\n\n\n<p>A partir de cette premi\u00e8re approche partielle, on peut se demander comment faire pour r\u00e9duire de x% ces \u00e9missions, par les trois moyens classiques&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Substitution&nbsp;: remplacer les carburants fossiles par un moyen moins polluant, par exemple en prenant le TGV plut\u00f4t que l\u2019avion ou en utilisant le v\u00e9lo ou le m\u00e9tro plut\u00f4t que la voiture<\/li><li>Efficacit\u00e9 \u00e9nerg\u00e9tique&nbsp;: am\u00e9liorer la performance \u00e9nerg\u00e9tique, par exemple en isolant son logement ou en utilisant un v\u00e9hicule moins consommateur. R\u00e9guler son chauffage \u00e0 une temp\u00e9rature plus basse la nuit. Remplacer un voyage en avion par une t\u00e9l\u00e9conf\u00e9rence est d\u2019une efficacit\u00e9 \u00e9nerg\u00e9tique assez radicale&nbsp;!<\/li><li>Sobri\u00e9t\u00e9&nbsp;: mettre un pull-over ou une couverture de plus et r\u00e9gler le chauffage un degr\u00e9 plus bas a une efficacit\u00e9 certaine. Dans quelques d\u00e9cennies, il est probable que l\u2019on ne disposera plus d\u2019assez de k\u00e9ros\u00e8ne pour continuer \u00e0 multiplier les voyages touristiques \u00e0 longue distances (les avis sont tr\u00e8s partag\u00e9s sur le nombre de d\u00e9cennies de cette pr\u00e9vision)<\/li><\/ul>\n\n\n\n<p>A noter que <a rel=\"noreferrer noopener\" href=\"https:\/\/www.bilans-ges.ademe.fr\/documentation\/UPLOAD_DOC_FR\/index.htm?gaz.htm\" target=\"_blank\">d\u2019apr\u00e8s l\u2019ADEME<\/a>, en prenant en compte tout le cycle de vie du gaz naturel ((production, transport, distribution, combustion), on arrive \u00e0 0,227 Kg de CO2e<\/p>\n\n\n\n<p>Attention, il ne s&rsquo;agit que d&rsquo;une approche partielle! Ceux qui veulent aller plus loin dans le calcul de leur empreinte carbone peuvent consulter <a rel=\"noreferrer noopener\" href=\"https:\/\/bonpote.com\/comment-calculer-son-empreinte-carbone\/\" target=\"_blank\">ce site<\/a><\/p>\n\n\n\n<p>Petite remarque sur le bilan en TEC ou en CO2 : la <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Masse_atomique\" target=\"_blank\" rel=\"noreferrer noopener\">masse atomique<\/a> du Carbone est de 12, celle de l&rsquo;oxyg\u00e8ne de 16. La masse atomique du CO2 est donc de 44 (12 + 16 + 16), soit 3,67 fois celle du carbone. C&rsquo;est ce multiple qu&rsquo;il faut utiliser pour transformer le bilan carbone de 2008 en bilan CO2<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dans le cadre de sa r\u00e9flexion sur les transitions, la ville de Sceaux a pr\u00e9vu de r\u00e9aliser un bilan carbone de l\u2019ensemble de son territoire. Elle a mis \u00e0 disposition des membres du comit\u00e9 consultatif des transitions (CCT) celui d\u00e9j\u00e0 r\u00e9alis\u00e9 en 2008 (en fait le rapport de synth\u00e8se). Que&#8230;<\/p>\n","protected":false},"author":11,"featured_media":2923,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[53,266],"tags":[],"class_list":["post-2865","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-analyses","category-sceaux","entry","simple"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Bilan carbone de Sceaux - La Gazette<\/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:\/\/sceaux-lagazette.fr\/index.php\/2021\/01\/11\/bilan-carbone-de-sceaux\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Bilan carbone de Sceaux - La Gazette\" \/>\n<meta property=\"og:description\" content=\"Dans le cadre de sa r\u00e9flexion sur les transitions, la ville de Sceaux a pr\u00e9vu de r\u00e9aliser un bilan carbone de l\u2019ensemble de son territoire. Elle a mis \u00e0 disposition des membres du comit\u00e9 consultatif des transitions (CCT) celui d\u00e9j\u00e0 r\u00e9alis\u00e9 en 2008 (en fait le rapport de synth\u00e8se). 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