1. Earth Systems Research Center, Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, NH 03824
2. Department of Agricultural Economics, Purdue University, West Lafayette, IN 47907
3. Department of Political Science, Purdue University, West Lafayette, IN 47907
4. School of Industrial Engineering, Purdue University, West Lafayette, IN 47907
5. Department of Plant and Agroecosystem Sciences, University of Wisconsin-Madison, Madison, WI 53706
6. Department of Natural Resources and the Environment, University of New Hampshire, Durham, NH 03824