1. Center for Systems Integration and Sustainability, Department of Fisheries and Wildlife, Michigan State University, East Lansing, MI 48824, USA.
2. Environmental Science and Policy Program, Michigan State University, East Lansing, MI 48824, USA.
3. Center for Limnology, University of Wisconsin, Madison, WI 53706, USA.
4. Department of Urban Design and Planning, University of Washington, Seattle, WA 98195, USA.
5. The Beijer International Institute of Ecological Economics, The Royal Swedish Academy of Sciences, Post Office Box 50005, SE 104 05 Stockholm, Sweden.