1. Fletcher School of Law and Diplomacy, Tufts University, Medford, Massachusetts 02155
2. Center for International Environment and Resource Policy, Tufts University, Medford, Massachusetts 02155
3. Environmental Studies Program, University of Colorado Boulder, Boulder, Colorado 80303;
4. Plant Production Systems Group, Wageningen University, Wageningen 6700 AK, The Netherlands
5. College of Social Science and Humanities, Northeastern University, Boston, Massachusetts 02120
6. Institute on the Environment, University of Minnesota, St. Paul, Minnesota 55108
7. Institute for Resources, Environment and Sustainability, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
8. Friedman School of Nutrition Science and Policy, Tufts University, Boston, Massachusetts 02111