{"id":59774,"date":"2023-07-11T13:29:09","date_gmt":"2023-07-11T11:29:09","guid":{"rendered":"https:\/\/www.immo-invest.ch\/4000-szenarien-fuer-die-klimawende\/"},"modified":"2023-07-12T10:18:59","modified_gmt":"2023-07-12T08:18:59","slug":"4000-szenarien-fuer-die-klimawende","status":"publish","type":"post","link":"https:\/\/www.immo-invest.ch\/fr\/4000-szenarien-fuer-die-klimawende\/","title":{"rendered":"4000 sc\u00e9narios pour le changement climatique"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Actuellement, l&rsquo;humanit\u00e9 \u00e9met 42 milliards de tonnes de dioxyde de carbone par an. Selon les calculs du Groupe d&rsquo;experts intergouvernemental sur l&rsquo;\u00e9volution du climat (GIEC), seuls 300 \u00e0 600 milliards de tonnes suppl\u00e9mentaires sont autoris\u00e9s depuis 2020, faute de quoi l&rsquo;objectif de limiter le r\u00e9chauffement climatique \u00e0 1,5 degr\u00e9 Celsius sera difficilement r\u00e9alisable. Evangelos Panos, du laboratoire d&rsquo;analyse des syst\u00e8mes \u00e9nerg\u00e9tiques du PSI, se rallie \u00e0 cette conclusion : \u00ab\u00a0Cela pourrait \u00eatre juste, car dans 70% de nos sc\u00e9narios, le monde d\u00e9passera la barre des 1,5 degr\u00e9 Celsius dans les cinq prochaines ann\u00e9es\u00a0\u00bb<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Quelles mesures climatiques ont le plus de succ\u00e8s ?<br><\/strong>Dans le contexte du changement climatique, de nombreuses d\u00e9cisions politiques, \u00e9conomiques et sociales doivent \u00eatre prises. Celles-ci sont toutefois entach\u00e9es de nombreuses incertitudes. Il est compr\u00e9hensible que les responsables cherchent des bases solides pour r\u00e9pondre par exemple \u00e0 l&rsquo;une des questions centrales : Quelles sont les mesures qui ont le plus d&rsquo;impact et qui sont \u00e9conomiquement avantageuses pour atteindre l&rsquo;objectif de z\u00e9ro \u00e9mission nette, comme la Suisse s&rsquo;y est engag\u00e9e ? Les r\u00e9ponses sont d\u00e9sormais fournies par une grande simulation informatique qui a \u00e9t\u00e9 d\u00e9velopp\u00e9e sur ce th\u00e8me. Elle associe des mod\u00e8les climatiques \u00e0 des mod\u00e8les \u00e9conomiques et \u00e0 1200 technologies de fourniture et d&rsquo;utilisation de l&rsquo;\u00e9nergie ainsi que de r\u00e9duction des \u00e9missions de gaz \u00e0 effet de serre. Dans le cadre de l&rsquo;\u00e9tude, un superordinateur a calcul\u00e9 4000 sc\u00e9narios pour 15 r\u00e9gions du monde, en tenant compte \u00e0 chaque fois des \u00e9volutions possibles par \u00e9tapes de dix ans jusqu&rsquo;en 2100. \u00ab\u00a0Cela n\u00e9cessite des techniques sophistiqu\u00e9es d&rsquo;analyse et de visualisation des donn\u00e9es\u00a0\u00bb, ajoute le co-auteur James Glynn, responsable de la plate-forme d&rsquo;analyse pour la mod\u00e9lisation des syst\u00e8mes \u00e9nerg\u00e9tiques \u00e0 l&rsquo;universit\u00e9 de Columbia aux \u00c9tats-Unis. Le fichier final repr\u00e9sente 700 gigaoctets. L&rsquo;article de recherche y aff\u00e9rent vient d&rsquo;\u00eatre publi\u00e9 dans le m\u00e9dia sp\u00e9cialis\u00e9 Energy Policy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ce qui rend le travail d&rsquo;Evangelos Panos et des co-auteurs si particulier : Leurs mod\u00e8les d&rsquo;\u00e9valuation int\u00e9gr\u00e9s tiennent compte pour la premi\u00e8re fois de nombreuses incertitudes inh\u00e9rentes aux mod\u00e8les. Jusqu&rsquo;\u00e0 pr\u00e9sent, les sc\u00e9narios partaient g\u00e9n\u00e9ralement du principe que tous les param\u00e8tres \u00e9taient connus pour l&rsquo;avenir, comme la date de disponibilit\u00e9 des technologies et leur co\u00fbt ou l&rsquo;ampleur du potentiel de d\u00e9veloppement des \u00e9nergies renouvelables. Les calculs du GIEC se concentrent en outre uniquement sur les options technologiques, c&rsquo;est-\u00e0-dire sur la question de l&rsquo;impact du choix de certaines technologies sur le climat. Les incertitudes li\u00e9es aux mod\u00e8les climatiques et \u00e0 la mani\u00e8re dont le climat r\u00e9agit \u00e0 la croissance \u00e9conomique ne sont pas prises en compte, pas plus que de nombreuses autres incertitudes, comme celles li\u00e9es \u00e0 l&rsquo;\u00e9volution d\u00e9mographique ou aux mesures politiques. \u00ab\u00a0La contribution la plus importante de notre recherche est qu&rsquo;elle permet aux d\u00e9cideurs politiques de prendre des d\u00e9cisions concr\u00e8tes sur les mesures climatiques en toute connaissance des incertitudes existantes\u00a0\u00bb, souligne le co-auteur Brian \u00d3 Gallach\u00f3ir de l&rsquo;University College Cork.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>18 facteurs d&rsquo;incertitude et 72 000 variables<br><\/strong>Lorsque les chercheurs veulent calculer des sc\u00e9narios contenant de nombreuses variables et incertitudes, ils ont souvent recours \u00e0 la m\u00e9thode dite de Monte Carlo. La m\u00e9thode de Monte Carlo ne pr\u00e9dit pas l&rsquo;avenir. \u00ab\u00a0Elle dresse plut\u00f4t une sorte de carte de donn\u00e9es avec des chemins d\u00e9cisionnels de type \u00ab\u00a0what if\u00a0\u00bb\u00a0\u00bb, explique Evangelos Panos. C&rsquo;est le cas dans l&rsquo;\u00e9tude actuelle : l&rsquo;\u00e9quipe a fait varier 72 000 variables pour chaque sc\u00e9nario. \u00ab\u00a0Nous avons pris en compte 18 facteurs d&rsquo;incertitude, notamment la croissance d\u00e9mographique et \u00e9conomique, la sensibilit\u00e9 au climat, le potentiel des ressources, l&rsquo;impact des changements dans l&rsquo;agriculture et la sylviculture, le co\u00fbt des technologies \u00e9nerg\u00e9tiques et le d\u00e9couplage entre la demande d&rsquo;\u00e9nergie et le d\u00e9veloppement \u00e9conomique\u00a0\u00bb, explique James Glynn de l&rsquo;universit\u00e9 de Columbia.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Base solide pour les trajectoires nationales vers la transition \u00e9nerg\u00e9tique<br><\/strong>Pour d\u00e9composer les sc\u00e9narios individuels ax\u00e9s sur les questions politiques et \u00e9conomiques en diff\u00e9rentes trajectoires nationales vers la transition \u00e9nerg\u00e9tique, des param\u00e8tres suppl\u00e9mentaires sp\u00e9cifiques \u00e0 chaque pays doivent \u00eatre pris en compte. \u00ab\u00a0Un syst\u00e8me \u00e9nerg\u00e9tique qui permet la transition vers une \u00e9conomie sans carbone est un syst\u00e8me \u00e0 forte intensit\u00e9 de capital qui n\u00e9cessite la mobilisation des ressources de tous les acteurs\u00a0\u00bb, r\u00e9sume Panos. Pour cela, des analyses sur mesure au niveau national sont n\u00e9cessaires : \u00ab\u00a0Notre \u00e9tude fournit une base solide pour cela\u00a0\u00bb<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Gr\u00e2ce \u00e0 une vaste simulation informatique du climat, de l&rsquo;\u00e9conomie mondiale et du syst\u00e8me \u00e9nerg\u00e9tique global, des chercheurs du PSI ont analys\u00e9, en collaboration avec des coll\u00e8gues des \u00c9tats-Unis, de Chine, d&rsquo;Irlande, de Finlande et de Su\u00e8de, diff\u00e9rentes possibilit\u00e9s de changement climatique.<\/p>\n","protected":false},"author":2,"featured_media":18175,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"pmpro_default_level":"","_surecart_dashboard_logo_width":"180px","_surecart_dashboard_show_logo":true,"_surecart_dashboard_navigation_orders":true,"_surecart_dashboard_navigation_invoices":true,"_surecart_dashboard_navigation_subscriptions":true,"_surecart_dashboard_navigation_downloads":true,"_surecart_dashboard_navigation_billing":true,"_surecart_dashboard_navigation_account":true,"inline_featured_image":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[22699],"tags":[40625,8748,40626,2199,40627,22545],"class_list":["post-59774","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-durabilite","tag-computer-simulation-fr","tag-energiesystem-fr","tag-globale-wirtschaft-fr","tag-klima-fr","tag-klimawende-fr","tag-psi-fr","pmpro-has-access"],"acf":{"bild_mit_ki_erstellt_worden":[],"lead":"Gr\u00e2ce \u00e0 une vaste simulation informatique du climat, de l'\u00e9conomie mondiale et du syst\u00e8me \u00e9nerg\u00e9tique global, des chercheurs du PSI ont analys\u00e9, en collaboration avec des coll\u00e8gues des \u00c9tats-Unis, de Chine, d'Irlande, de Finlande et de Su\u00e8de, diff\u00e9rentes possibilit\u00e9s de changement climatique.","autor":"Quelle: psi.ch","ort":"","bildunterschrift":"","zusammenfassung":"","bild_im_grid":false,"gallerie":"","newsim":""},"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - 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