1. U.S. Geological Survey Upper Midwest Environmental Sciences Center La Crosse Wisconsin USA
2. Department of Agricultural and Resource Economics Colorado State University Ft. Collins Colorado USA
3. U.S. Geological Survey U.S. Geological Survey, Geosciences and Environmental Change Science Center Denver Colorado USA
4. School of Natural Resources and the Environment The University of Arizona Tucson Arizona USA
5. Udall Center for Studies in Public Policy The University of Arizona Tucson Arizona USA