1. Department of Economics, University of Wyoming, Laramie, Wyoming, USA
2. CICERO Center for International Climate Research, Oslo, Norway
3. Department of Agricultural and Resource Economics, Colorado State University, Ft Collins, Colorado, USA
4. Department of Economics, Appalachian State University, Boone, North Carolina, USA
5. School of Environment, Enterprise and Development, University of Waterloo, Waterloo, Ontario, Canada
6. CESifo, Munich, Germany