1. Department of Geography, University of Cambridge , Cambridge CB2 3EN , UK
2. Global Change Research Institute of the Czech Academy of Sciences , Brno 603 00 , Czech Republic
3. Swiss Federal Research Institute (WSL) , Birmensdorf 8903 , Switzerland
4. Department of Geography, Faculty of Science, Masaryk University , Brno 613 00 , Czech Republic
5. Department Anthropology, Washington University , St Louis, MO 63130-4899 , USA
6. Department of Geography, Johannes Gutenberg University , Mainz 55099 , Germany