1. Environmental Science and Policy Program and Departments of Sociology and Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824, USA.
2. Center for the Study of Institutions, Population, and Environmental Change and Workshop in Political Theory and Policy Analysis, Indiana University, Bloomington, IN 47408, USA.
3. Division of Social and Behavioral Sciences and Education, The National Academies, Washington, DC 20001, USA.