1. Fondazione Eni Enrico Mattei; Venice Italy
2. Department of Economics; Cà Foscari University of Venice; Venice Italy
3. Department of Economics and Economic History and Institute for Environmental Science and Technology; Universitat Autònoma de Barcelona; Bellaterra Spain
4. ICREA; Barcelona Spain
5. Institute for Environmental Studies; VU University Amsterdam; Amsterdam Netherlands
6. Department of Spatial Economics; VU University Amsterdam; Amsterdam Netherlands