1. Senior Researcher, Deltares, P.O. Box 177, Delft 2600 MH, Netherlands.
2. Senior Lecturer in Economics, School of International Development, Univ. of East Anglia, Norwich NR4 7TJ, U.K.; and Senior Researcher, Institute for Environmental Studies, Vrije Univ. Amsterdam, De Boelelaan 1087, Amsterdam 1081 HV, Netherlands (corresponding author).
3. Researcher, Institute for Environmental Studies, Vrije Univ. Amsterdam, De Boelelaan 1087, Amsterdam 1081 HV, Netherlands.
4. Researcher, Institute for Interdisciplinary Mountain Research (IGF), Austrian Academy of Sciences, Innsbruck 6020, Austria.
5. Professor, Institute of Earth and Environmental Science, Univ. of Potsdam, Potsdam-Golm 14476, Germany.