1. H. Milton Stewart School of Industrial and Systems Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
2. International Institute for Applied Systems Analysis (IIASA), Schlossplatz 1, Laxenburg A-2361, Austria
3. CMCC Foundation─Euro-Mediterranean Center on Climate Change, Via Marco Biagi 5, Lecce 73100, Italy
4. RFF-CMCC European Institute on Economics and the Environment, Via Bergognone 34, Milan 20144, Italy
5. School of Public Policy, Georgia Institute of Technology, Atlanta, Georgia 30332, United States