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Pr&#233;sentationAlexander von Humboldt est n&#233; il y a 250 ans &#224; Berlin, en Prusse, et a pass&#233; la moiti&#233; de sa vie &#224; l'&#233;tranger, notamment &#224; Paris. Physicien et naturaliste voyageur de l'Europe des Lumi&#232;res et du Romantisme, il a contribu&#233; &#224; de nombreux domaines scientifiques d&#233;velopp&#233;s au d&#233;but du XIXe si&#232;cle, notamment la g&#233;ographie physique, la g&#233;ologie, le g&#233;omagn&#233;tisme, la g&#233;ographie v&#233;g&#233;tale, la climatologie et autres, et ouvert la voie &#224; une vision holistique (Weltanschaung), inspirant les pionniers de l'&#233;cologie, les id&#233;es de la biosph&#232;re et Ga&#239;a, et ce que les historiens des sciences naturelles appel&#232;rent, la science &#171;&#160;Humboldtienne&#160;&#187;, notamment l'histoire humaine de la nature. Il a nomm&#233; le monde comme aucun autre scientifique (villes, rivi&#232;res, cha&#238;nes de montagnes et courants oc&#233;aniques, sans parler des pingouins et des calmars). Il a explor&#233; la Terre comme une plan&#232;te dans le syst&#232;me solaire, des mines les plus profondes aux plus hauts sommets des volcans, accompagnant la naissance de la pens&#233;e g&#233;ologique moderne et de la g&#233;ophysique globale, construisant la base de ce que l'on appelle maintenant l'&#233;cologie, consid&#233;r&#233;e comme un ensemble de processus bio-physiques et chimiques dans lequel l'humanit&#233; n'est qu'un acteur parmi d'autres. Sa pens&#233;e visionnaire des syst&#232;mes a profond&#233;ment influenc&#233; Darwin, les p&#233;dologues russes, Vernadsky, et encore aujourd'hui Lovelock, le mouvement &#233;cologique et ce que nous appelons maintenant les sciences du syst&#232;me terrestre ou science du syst&#232;me terrestre. Profond&#233;ment lib&#233;ral et d&#233;mocratique, admirateur des r&#233;volutions am&#233;ricaine et fran&#231;aise, anticolonialiste, son travail ethnographique et anthropologique et sociologique de la mis&#232;re sociale doivent beaucoup &#224; sa conception radicale non conventionnelle de la libert&#233;.L'id&#233;e de ce colloque d'une journ&#233;e sur Alexandre de Humboldt est de r&#233;unir des sp&#233;cialistes de diverses disciplines qui couvrent aujourd'hui les nombreux domaines auxquels le travail et les id&#233;es de Humboldt ont contribu&#233;, en particulier dans son &#339;uvre ma&#238;tresse Kosmos (1845-1862). Nous voulons montrer comment le travail scientifique de ce plus grand encyclop&#233;diste de la premi&#232;re moiti&#233; de l'Europe du XIXe si&#232;cle est plus que jamais au c&#339;ur des questions li&#233;es &#224; notre plan&#232;te d'origine, la Terre, et aux questions pos&#233;es par notre entr&#233;e dans l&#8217;Anthropoc&#232;ne.Vendredi 22 novembre 2019, Alexandre de Humbold et les sciences du syst&#232;me Terre. Institut de Physique du Globe de Paris.PresentationAlexander von Humboldt was born 250 years ago in Berlin, Prussia, and spent half of his life abroad, notably in Paris. Physicist and naturalist traveler (explorer and travel writer) of the Enlightened and Romantic Europe, he contributed to many scientific fields developed in the early nineteenth century, including physical geography, geology, geomagnetism, plant geography, climatology, and others, and showed the way for a holistic worldview (Weltanschaung), inspiring the pioneers of ecology, the ideas of Biosphere and Gaia, and what historians of natural sciences called &#8220;Humboldtian science&#8221;, including the human history of Nature. He names the living world, or Nature, as a whole like no other scientist (cities, rivers, mountain ranges, and ocean currents, not to mention penguins and squid). He explored the Earth as a planet in the solar system from the deepest mines to the highest summits of volcanoes, accompanying the birth of modern geological thought and global geophysics, building the base of what is now called ecology, seen as a set of bio-physico-chemical processes in which Mankind is only one actor among others. His visionary systems thinking profoundly influenced Darwin, Russian soil scientists, Vernadsky, and still today Lovelock, the ecological movement and what we now call the Earth System Sciences or Earth System Science. Deeply liberal and democratic, admirer of the American and French revolutions, anti-colonialist, his ethnographic and anthropological work and sociology of social misery owe much to his unconventional radical conception of freedom.The idea of ​​this one-day colloquium on Alexander von Humboldt is to bring together specialists from various disciplines that today cover the many fields that Humboldt's work and ideas have contributed to, in particular in his major unfinished multi-volume masterwork Kosmos (1845-1862), including an index of more of 1100 pages. If possible, a visit to Humboldt's collections at the Museum of Natural History in Paris will be organized. We wish to show how the scientific work of this greatest encyclopedic scientist from the first half of Nineteenth-century Europe is more than ever at the heart of the questions related to our home planet Earth today and to the questions posed by the epistemological and ontological novelty of the Anthropocene concept.ProgramOral sessionsNov. 22nd, 2019, 9:00Opening and IntroductionSession: Literature, history of sciences and political sciences.Chairman : B. Latour (Sc. Po Paris)Laura Dassow Walls (U. Notre-Dame, USA)Ottmar Ette (U. Potsdam)John Tresch (U. London)Nov. 22th, 2019, 11:00Session: Natural sciences (geophysical, ecological, critical zone sciences).Chairman : S. Dutreuil (CNRS)Jean-Paul Poirier (IPGP)Friedhelm von Blanckenburg (GFZ Potsdam, Freie U. Berlin)Stephen T. Jackson (USGS and U. of Arizona)12:30-14:00: Buffet and poster session14:00-18:00: WorkshopsWorkshops will aim at crossing disciplinary different points of view around Alexander von Humboldt visions at the time of the Anthropocene debate:Theme 1: Nature, cosmos, ecology:how the public awareness of the current Anthropocene crisis allows us rethinking our relationship and dependency to the Earth?Moderator: A. Dahan (CNRS)Participants:S. Br&#246;nnimann (U. Bern)C. Hoorn (U. Amsterdam)J. Grine-vald (IHEID)O. Ette (U. Potsdam)Theme 2: Science and communication:With the emergence of the Anthropocene, how does Humboldt's though help to overcome the disconnections between scientific expertise and social and political actors?Moderator: S. Boudia (U. Paris)Participants:M. N. Bourguet (U. Paris Diderot)L. Peaud (U. Grenoble-Alpes) S. revsm&#252;hl (EHESS) G. FarinelliF (U. Bologne)18:00: Conclusing remarks by M. Lussault (ENS Lyon)Humboldt and the AnthropoceneOrganizersJ. Gaillardet (IPGP, U. Paris, IUF), G. Fumey (Sorbonne U.)Scientic advisory boardJ. Gaillardet (IPGP)G. Fumey (Sorbonne U)F. von Blanckenburg (GFZ Potsdam)B. Latour (Sc. Po)J. Grinevald (IHEID, Geneva)contact: gaillardet@ipgp.fr, gilles.fumey@gmail.comRegistration is mandatory