{"id":1957,"date":"2020-09-15T15:18:14","date_gmt":"2020-09-15T13:18:14","guid":{"rendered":"https:\/\/sceaux-lagazette.fr\/?p=1957"},"modified":"2020-10-05T10:57:03","modified_gmt":"2020-10-05T08:57:03","slug":"ecologie-un-eclairage-basse-tension","status":"publish","type":"post","link":"https:\/\/sceaux-lagazette.fr\/index.php\/2020\/09\/15\/ecologie-un-eclairage-basse-tension\/","title":{"rendered":"Ecologie : un \u00e9clairage basse tension"},"content":{"rendered":"\n<p>La hausse des temp\u00e9ratures moyennes \u00e0 la superficie du globe terrestre, annonc\u00e9e depuis quelques d\u00e9cennies par le GIEC est manifeste ces derni\u00e8res ann\u00e9es. Le r\u00f4le des activit\u00e9s anthropiques dans les \u00e9missions de gaz \u00e0 effet de serre est bien document\u00e9. Mais celles-ci continuent \u00e0 augmenter, avec la croissance \u00e9conomique (\u00e0 laquelle s\u2019ajoute la croissance de la population).<\/p>\n\n\n\n<p>Le pr\u00e9sent article vise \u00e0 donner quelques rep\u00e8res simples sur la question des moyens de r\u00e9duire ces \u00e9missions en France.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Deux pr\u00e9alables<\/h2>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignright size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2020\/10\/StructureCO2.jpg\" alt=\"\" class=\"wp-image-2116\" width=\"249\" height=\"86\" srcset=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2020\/10\/StructureCO2.jpg 406w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2020\/10\/StructureCO2-300x103.jpg 300w\" sizes=\"(max-width: 249px) 100vw, 249px\" \/><figcaption>1pm=1picom\u00e8tre=un milliardi\u00e8me de millim\u00e8tre<br>C&rsquo;est petit mais sournois<\/figcaption><\/figure><\/div>\n\n\n\n<p>Les sp\u00e9cialistes ont pris l\u2019habitude de raisonner sur l\u2019ensemble du cycle de vie. Cela permet par exemple d\u2019\u00e9viter de choisir une solution moins \u00e9mettrice de CO2 \u00e0 la construction mais qui l\u2019est nettement plus lors de son utilisation.<\/p>\n\n\n\n<p>Le r\u00e9chauffement climatique n\u2019est pas le seul probl\u00e8me \u00e0 traiter. Il faut aussi voir les impacts des solutions envisag\u00e9es sur d\u2019autres probl\u00e8mes. L\u2019exemple le plus frappant sur le sujet est le nucl\u00e9aire, excellente solution si on ne raisonne qu\u2019\u00e9mission de gaz de serre, mais contest\u00e9es par certains pour d\u2019autres raisons<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Trois axes d\u2019action<\/h2>\n\n\n\n<p>Pour r\u00e9duire les \u00e9missions de gaz \u00e0 effet de serre, on peut envisager trois types de solution (et les combiner aussi&nbsp;!):<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Efficacit\u00e9 \u00e9nerg\u00e9tique<\/li><li>Substitution<\/li><li>Sobri\u00e9t\u00e9<\/li><\/ul>\n\n\n\n<p><strong>L\u2019efficacit\u00e9 \u00e9nerg\u00e9tique<\/strong> consiste \u00e0 produire le m\u00eame service en consommant moins. C\u2019est ainsi que de nouveaux moteurs ont permis \u00e0 Airbus une consommation diminu\u00e9e de 15 % dans les versions dites \u00ab&nbsp;NEO&nbsp;\u00bb<a href=\"#_ftn1\">[1]<\/a>. Dans le secteur du chauffage r\u00e9sidentiel\/tertiaire, les gains peuvent \u00eatre impressionnants si le b\u00e2timent est mal isol\u00e9 au d\u00e9part. A priori, on peut partout se poser la question de l\u2019efficacit\u00e9 \u00e9nerg\u00e9tique, mais il faut avoir \u00e0 l\u2019esprit que cela fait des d\u00e9cennies (voire des si\u00e8cles) que l\u2019on cherche \u00e0 progresser dans ce domaine.<\/p>\n\n\n\n<p><strong>La substitution<\/strong> consiste \u00e0 passer d\u2019une \u00e9nergie carbon\u00e9e (charbon, p\u00e9trole, gaz) \u00e0 une autre source qui ne l\u2019est pas et est g\u00e9n\u00e9ralement beaucoup moins productrice de CO2. Le passage \u00e0 l\u2019\u00e9lectricit\u00e9 est un exemple de substitution (\u00e0 condition que la production d\u2019\u00e9lectricit\u00e9 soit elle-m\u00eame d\u00e9carbon\u00e9e.<\/p>\n\n\n\n<p><strong>La sobri\u00e9t\u00e9<\/strong> consiste \u00e0 consommer moins, \u00e0 remettre en cause un type de consommation qui ne peut \u00eatre r\u00e9duit par les moyens pr\u00e9c\u00e9dents. Les trajets transatlantiques en avion en sont un bon exemple (on ne sait pas faire voler sans \u00e9nergie carbon\u00e9 un avion de transport). On peut aussi consommer autrement (par exemple accepter de mettre cinq fois plus de temps pour aller de Paris \u00e0 Toulouse en train plut\u00f4t qu\u2019en avion).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">R\u00e9flexion par secteur<\/h2>\n\n\n\n<p>Une premi\u00e8re approche des \u00e9missions de gaz \u00e0 effet de serre se fait par secteur, en en distinguant six. On trouvera ci-dessous un tableau pr\u00e9cisant la contribution de chaque secteur, en 1990 et 2018, en valeur absolue et en pourcentage. (MTCO2e = millions de tonnes en \u00e9quivalent CO2)<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\">1990 (MTCO2e)<\/td><td class=\"has-text-align-center\" data-align=\"center\">1990 %<\/td><td class=\"has-text-align-center\" data-align=\"center\">2018 (MTCO2e)<\/td><td class=\"has-text-align-center\" data-align=\"center\">2018 %<\/td><\/tr><tr><td>Transformation \u00e9nergie<\/td><td class=\"has-text-align-center\" data-align=\"center\">76<\/td><td class=\"has-text-align-center\" data-align=\"center\">14<\/td><td class=\"has-text-align-center\" data-align=\"center\">41<\/td><td class=\"has-text-align-center\" data-align=\"center\">10<\/td><\/tr><tr><td>Industrie manufacturi\u00e8re<\/td><td class=\"has-text-align-center\" data-align=\"center\">144<\/td><td class=\"has-text-align-center\" data-align=\"center\">27<\/td><td class=\"has-text-align-center\" data-align=\"center\">78<\/td><td class=\"has-text-align-center\" data-align=\"center\">18<\/td><\/tr><tr><td>Traitement centralis\u00e9 des d\u00e9chets<\/td><td class=\"has-text-align-center\" data-align=\"center\">15<\/td><td class=\"has-text-align-center\" data-align=\"center\">3<\/td><td class=\"has-text-align-center\" data-align=\"center\">13<\/td><td class=\"has-text-align-center\" data-align=\"center\">3<\/td><\/tr><tr><td>R\u00e9sidentiel Tertiaire<\/td><td class=\"has-text-align-center\" data-align=\"center\">92<\/td><td class=\"has-text-align-center\" data-align=\"center\">17<\/td><td class=\"has-text-align-center\" data-align=\"center\">83<\/td><td class=\"has-text-align-center\" data-align=\"center\">19<\/td><\/tr><tr><td>Agriculture\/ sylviculture hors UTCATF<\/td><td class=\"has-text-align-center\" data-align=\"center\">92<\/td><td class=\"has-text-align-center\" data-align=\"center\">17<\/td><td class=\"has-text-align-center\" data-align=\"center\">85<\/td><td class=\"has-text-align-center\" data-align=\"center\">20<\/td><\/tr><tr><td>Transports<\/td><td class=\"has-text-align-center\" data-align=\"center\">121<\/td><td class=\"has-text-align-center\" data-align=\"center\">22<\/td><td class=\"has-text-align-center\" data-align=\"center\">132<\/td><td class=\"has-text-align-center\" data-align=\"center\">30<\/td><\/tr><tr><td>Total<\/td><td class=\"has-text-align-center\" data-align=\"center\">542<\/td><td class=\"has-text-align-center\" data-align=\"center\">100<\/td><td class=\"has-text-align-center\" data-align=\"center\">433<\/td><td class=\"has-text-align-center\" data-align=\"center\">100<\/td><\/tr><\/tbody><\/table><figcaption>Source : CITEPA, rapport 2019<\/figcaption><\/figure>\n\n\n\n<p>Chaque secteur couvre des sous-secteurs qu\u2019il faut parfois investiguer. Par exemple, la production d\u2019\u00e9lectricit\u00e9 ne repr\u00e9sente qu\u2019un peu plus de la moiti\u00e9 des \u00e9missions du secteur \u00ab&nbsp;transformation d\u2019\u00e9nergie&nbsp;\u00bb et le raffinage en repr\u00e9sente pr\u00e8s d\u2019un quart. On trouve toutes ces donn\u00e9es d\u00e9taill\u00e9es sur le site du CITEPA&nbsp;: <a href=\"https:\/\/www.citepa.org\/fr\/donnees-emissions\/\">https:\/\/www.citepa.org\/fr\/donnees-emissions\/<\/a><\/p>\n\n\n\n<p>Le tableau ci-dessus ne reprend pas les \u00e9missions correspondant aux objets import\u00e9s, qu\u2019il faut rajouter pour \u00e9valuer l\u2019ensemble des impacts de notre pays sur les gaz \u00e0 effet de serre, mais qui demandent une autre approche concernant leur diminution.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Des sites pour aller plus loin<\/h2>\n\n\n\n<p>Le Shift Project est un think tank pr\u00e9sid\u00e9 par Jean Marc Jankovici. Il propose des actions pour lutter contre le r\u00e9chauffement climatique. Il n\u2019a pas r\u00e9ellement d\u2019\u00e9quivalent en France dans ce domaine <a href=\"https:\/\/theshiftproject.org\/\">https:\/\/theshiftproject.org\/<\/a>&nbsp;&nbsp;<\/p>\n\n\n\n<p>Le<a href=\"https:\/\/www.citepa.org\/fr\/\" target=\"_blank\" rel=\"noreferrer noopener\"> CITEPA<\/a> est <strong><u>le<\/u><\/strong> Centre technique de r\u00e9f\u00e9rence en mati\u00e8re de pollution atmosph\u00e9rique et de changement climatique. Il a \u00e9t\u00e9 fond\u00e9 en 1961 \u00e0 l\u2019initiative de <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Louis_Armand_(ing%C3%A9nieur)\" target=\"_blank\" rel=\"noreferrer noopener\">Louis Armand<\/a> (ancien patron de la SCNF, la place devant la gare de Lyon porte son nom). L\u2019anc\u00eatre du MEDEF et de grandes entreprises pr\u00e9sidaient \u00e0 sa fondation et ses adh\u00e9rents sont toujours pour l\u2019essentiel des entreprises. <\/p>\n\n\n\n<p><\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p><a href=\"#_ftnref1\">[1]<\/a> NEO (New engine option) d\u00e9signe chez Airbus les nouvelles motorisations dont sont \u00e9quip\u00e9s certains avions.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La hausse des temp\u00e9ratures moyennes \u00e0 la superficie du globe terrestre, annonc\u00e9e depuis quelques d\u00e9cennies par le GIEC est manifeste ces derni\u00e8res ann\u00e9es. Le r\u00f4le des activit\u00e9s anthropiques dans les \u00e9missions de gaz \u00e0 effet de serre est bien document\u00e9. Mais celles-ci continuent \u00e0 augmenter, avec la croissance \u00e9conomique (\u00e0&#8230;<\/p>\n","protected":false},"author":11,"featured_media":0,"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],"tags":[],"class_list":["post-1957","post","type-post","status-publish","format-standard","hentry","category-analyses","entry","simple"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Ecologie : un \u00e9clairage basse tension - 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\/2020\/09\/15\/ecologie-un-eclairage-basse-tension\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ecologie : un \u00e9clairage basse tension - La Gazette\" \/>\n<meta property=\"og:description\" content=\"La hausse des temp\u00e9ratures moyennes \u00e0 la superficie du globe terrestre, annonc\u00e9e depuis quelques d\u00e9cennies par le GIEC est manifeste ces derni\u00e8res ann\u00e9es. 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