Dr Jürgen Scheffran is a professor of Integrative Geography and Chair of the Research Group Climate Change and Security (CLISEC) in the CLICCS Cluster of Excellence and the Center for Earth System Research and Sustainability at the University of Hamburg. He works on security, migration and conflict associated with climate change and has been appointed to the German commission on refugees. For the physicist-by-education, further key areas of research include renewable energy and sustainable land use, human-nature interactions in the Anthropocene and modelling of complex systems, technology assessment, arms control, and international security.