1. International Institute for Applied Systems Analysis (IIASA), 2361 Laxenburg, Austria
2. School of the Environment, Trent University, Ontario, Canada K9J 7B8
3. IVL Swedish Environmental Research Institute, 400 14 Gothenburg, Sweden
4. Centre for Ecology & Hydrology, Bangor LL57 2UW, United Kingdom
5. Finnish Environment Institute (SYKE), 00251 Helsinki, Finland
6. Norwegian Institute for Water Research, 0349 Oslo, Norway
7. The James Hutton Institute, Craigiebuckler, Aberdeen AB15 8QH, United Kingdom