1. Instituto Pirenaico de Ecología (IPE-CSIC), Avda. Montañana 1005, Apdo. 202, 50192 Zaragoza, Spain.
2. Departamento de Ciencias Agroforestales, EiFAB, iuFOR-Universidad de Valladolid, Campus Duques de Soria, 42004 Soria, Spain.
3. Department of Geography, Johannes Gutenberg University, Mainz, Germany.
4. Ionplus AG, Lerzenstrasse 12, 8953 Dietikon, Switzerland.
5. Department of Geography, University of Cambridge, Cambridge, CB2 3EN, UK.
6. Swiss Federal Research Institute (WSL), CH-8903 Birmensdorf, Switzerland.
7. Global Change Research Centre and Masaryk University, 613 00 Brno, Czech Republic.