1. Center for the Study of Institutions, Population, and Environmental Change and Workshop in Political Theory and Policy Analysis, Indiana University, Bloomington, IN 47408, USA.
2. Environmental and Occupational Health Sciences Institute, Rutgers University, 170 Frelinghuysen Road, Piscataway, NJ 08854, USA.
3. Carnegie Institution of Washington, Stanford, CA 94305, USA.
4. Energy and Resources Group, University of California, Berkeley, CA 94720, USA.
5. National Research Council, Washington, DC 20418, USA.