1. University of BolognaDepartment of Economics Bologna Italy
2. RFF‐CMCC European Institute on Economics and the Environment (EIEE) Milano Italy
3. CIRED Nogent‐sur‐Marne France
4. Ecole des Ponts ParisTech Champs‐sur‐Marne France
5. Council on Economic Policies Zurich Switzerland
6. Vienna University of Economics and BusinessInstitute for Ecological Economics Vienna Austria