{"id":17638,"date":"2022-01-01T12:16:46","date_gmt":"2022-01-01T11:16:46","guid":{"rendered":"https:\/\/u-paris.fr\/centre-politiques-terre\/?p=17638"},"modified":"2025-08-25T15:22:40","modified_gmt":"2025-08-25T13:22:40","slug":"cycle-2022-2023","status":"publish","type":"post","link":"https:\/\/u-paris.fr\/centre-politiques-terre\/cycle-2022-2023\/","title":{"rendered":"Cycle 2022 \/ 2023"},"content":{"rendered":"

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Chaque ann\u00e9e universitaire, le Centre des Politiques de la Terre questionne les effets de ses termes \u2013 \u00ab centre \u00bb, \u00ab politiques \u00bb et \u00ab terre \u00bb \u2013 et de leurs cha\u00eenes d\u2019interd\u00e9pendance en organisant mensuellement des s\u00e9minaires interdisciplinaires \u2013 invitant des scientifiques ext\u00e9rieur.e.s au Centre et issu.e.s des sciences naturelles et exp\u00e9rimentales & des sciences humaines et sociales \u2013 sur une probl\u00e9matique particuli\u00e8re. Chacune des s\u00e9ries de s\u00e9minaires du Centre se conclut avec un colloque convoquant des jeunes chercheur.se.s ext\u00e9rieur.e.s au Centre \u00e0 pr\u00e9senter leur propre recherche sur la probl\u00e9matique travaill\u00e9e pendant l\u2019ann\u00e9e.<\/p>\n

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\u00a9 Thomas Cuelho<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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\u00a0<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Habitabilit\u00e9s<\/h2>\n

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Le cycle de s\u00e9minaire de l\u2019ann\u00e9e universitaire 2022\/2023 est consacr\u00e9 aux formes hybrides d\u2019habitabilit\u00e9 de la Terre soit \u00e0 la mani\u00e8re dont les humain.e.s tendent \u00e0 s\u2019approprier leurs environnements pour les transformer en des \u00ab milieux de vie \u00bb (urbains, ruraux, montagnards, aquatiques, etc.), au cours de co-transformations en perp\u00e9tuel renouvellement mettant aux prises mati\u00e8res, actions et symboles.<\/p>\n

Le milieu habitable est celui qui permet \u00e0 l\u2019humain de l\u2019occuper durablement, d\u2019y am\u00e9nager son habitat, d\u2019y \u00e9tablir des relations, ou encore d\u2019acc\u00e9der aux ressources n\u00e9cessaires \u00e0 sa vie. \u00c0 ce titre, il d\u00e9passe largement le seul r\u00e8gne humain et inclut l\u2019air, l\u2019eau, la terre mais \u00e9galement le carbone, l\u2019azote, l\u2019oxyg\u00e8ne, le phosphore, ainsi que, sous une autre perspective, les autres organismes (depuis les bact\u00e9ries aux animaux en passant par les plantes et les min\u00e9raux). Autant d\u2019\u00e9l\u00e9ments, d\u2019acteur.trice.s et de processus qui entrent en interaction \u00e0 diff\u00e9rentes \u00e9chelles et qui relient activement les milieux les uns aux autres au sein de cha\u00eenes d\u2019actions, de r\u00e9troactions et d\u2019interd\u00e9pendances encore trop mal comprises. L\u2019habitabilit\u00e9 a ainsi pu \u00eatre envisag\u00e9e comme le produit d\u2019une Terre con\u00e7ue tel un syst\u00e8me g\u00e9ophysiologique autor\u00e9gul\u00e9 \u2013 \u00e0 l\u2019instar de l\u2019hypoth\u00e8se Ga\u00efa formul\u00e9e par James Lovelock. Or, la crise sociale et environnementale contemporaine, ainsi que l\u2019effondrement de certains milieux sous l\u2019effet des activit\u00e9s humaines, nous montrent les limites d\u2019une conception abstraite et uniforme de l\u2019habitabilit\u00e9. Le concept de \u00ab Zone Critique \u00bb permet ainsi d\u2019envisager le milieu habitable du vivant comme une fine pellicule de la Terre, s\u2019\u00e9tendant des sols \u00e0 la basse atmosph\u00e8re, et de penser les multiples interconnexions physiques, chimiques et biologiques entre ces composantes. En ce sens, il invite \u00e0 consid\u00e9rer l\u2019ensemble des processus participant de l\u2019habitabilit\u00e9 des milieux en relocalisant et territorialisant les grands cycles biog\u00e9ochimiques longtemps envisag\u00e9s \u00e0 la seule \u00e9chelle plan\u00e9taire et isol\u00e9s par rapport au vivant.<\/p>\n

En outre, l\u2019habitabilit\u00e9 des milieux est situ\u00e9e, circonscrite par des \u00ab limites \u00bb plan\u00e9taires, conditionnant leur maintien, leur \u00e9volution ou encore leur r\u00e9fraction dans le temps et l\u2019espace. Loin de constituer un concept fig\u00e9, la notion de limite invite ainsi \u00e0 envisager les transformations des milieux au-del\u00e0 de l\u2019habitable, depuis les milieux d\u00e9grad\u00e9s aux ruines, et aux environnements durablement pollu\u00e9s ou contamin\u00e9s. Elle renvoie \u00e9galement au franchissement des points de bascule (tipping points) \u00e0 diff\u00e9rentes \u00e9chelles, aux temporalit\u00e9s critiques et aux strat\u00e9gies d\u2019adaptation des \u00eatres vivants face \u00e0 des opportunit\u00e9s et des contraintes changeantes. La notion d\u2019habitabilit\u00e9 constitue alors une fa\u00e7on de probl\u00e9matiser la crise sociale et environnementale en prenant en consid\u00e9ration la diversit\u00e9 des trajectoires selon les territoires et les in\u00e9galit\u00e9s en mati\u00e8re de ressources. Par ailleurs, ces habitabilit\u00e9s et inhabitabilit\u00e9s apparaissent aujourd\u2019hui comme largement produites, mises \u00e0 l\u2019agenda ou pass\u00e9es sous silence, par des formes de gouvernance plus ou moins locales de l\u2019environnement. \u00c0 bien des \u00e9gards, elles refl\u00e8tent autant les syst\u00e8mes de pouvoir et l\u2019organisation socio-\u00e9conomique des communaut\u00e9s humaines que les dynamiques complexes des grands cycles plan\u00e9taires, ces derniers n\u2019apparaissant plus comme un cadre donn\u00e9 et immuable \u00e0 l\u2019heure de l\u2019Anthropoc\u00e8ne.<\/p>\n

D\u00e8s lors, ce cycle de s\u00e9minaires vise \u00e0 associer et \u00e0 confronter diff\u00e9rentes perspectives sur les milieux habitables et habit\u00e9s par les humain.e.s, notamment dans leurs interactions entre eux.elles et avec d\u2019autres formes de vie. Au-del\u00e0 d\u2019une interrogation sur les limites plan\u00e9taires, il s\u2019agit de prolonger le questionnement sur les dynamiques, les acteurs, les \u00e9l\u00e9ments et les formes des milieux rendus inhabitables \u2013 ou en passe de l\u2019\u00eatre. L\u2019on pourra aussi discuter les \u00e9chelles pertinentes pour d\u00e9crire et analyser des formes d\u2019(in)habitabilit\u00e9. Une telle d\u00e9marche s\u2019efforce d\u2019\u00e9tablir un dialogue entre des sciences qui s\u2019int\u00e9ressent aux dynamiques bio-physico-chimiques, et d\u2019autres qui se sont sp\u00e9cialis\u00e9es dans la mani\u00e8re dont l\u2019humain habite le monde ; entre celles ayant fait des syst\u00e8mes leur cadre d\u2019analyse, et d\u2019autres privil\u00e9giant les formes de l\u2019exp\u00e9rience et la description dense. Dans cette perspective, l\u2019habitabilit\u00e9 nous para\u00eet constituer un objet heuristique car commun \u00e0 diff\u00e9rentes disciplines et permettant de faire dialoguer les \u00e9chelles. Au-del\u00e0 de l\u2019objet, il vise aussi \u00e0 mettre \u00e0 jour et \u00e0 renouveler les m\u00e9thodologies d\u2019analyse, en vue de poursuivre l\u2019effort engag\u00e9 par les cycles de s\u00e9minaires interdisciplinaires du Centre des Politiques de la Terre. Enfin, il sera question de mettre en \u00e9vidence les formes de gouvernance des milieux, qu\u2019ils soient habitables ou inhabitables, en vue de r\u00e9interroger la place de l\u2019action publique dans les \u00e9volutions que conna\u00eet notre plan\u00e8te et les enjeux soulev\u00e9s en mati\u00e8re d\u2019in\u00e9galit\u00e9s et de justice socio-environnementale. La production de connaissances, tout comme les repr\u00e9sentations et les imaginaires, ou encore les multiples formes d\u2019engagement individuel et collectif, se trouvent au c\u0153ur de la transformation des modes d\u2019habiter durablement la Terre.<\/p>\n

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Pour revoir les sessions des s\u00e9minaires :<\/p>\n

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