1. Institute of Environmental Engineering, ETH Zurich, HPZ E33, John-von-Neumann-Weg 9, 8093Zurich, Switzerland
2. Ecosystems Services and Management Program (ESM), International Institute for Applied Systems Analysis (IIASA), Schlossplatz 1, A-2361Laxenburg, Austria
3. Southern Swedish Forest Research Centre, Swedish University of Agricultural Sciences SLU, Sundsvägen 3, SE-230 53Alnarp, Sweden