Hans Joachim Schellnhuber
Hans Joachim "John" Schellnhuber (born 7 June 1950) is a German atmospheric physicist, climatologist and founding director of the Potsdam Institute for Climate Impact Research (PIK) and former chair of the German Advisory Council on Global Change (WBGU). Since 1 December 2023, Schellnhuber is the Director General of IIASA.
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