1. Department of Environmental Economics; Institute for Environmental Studies; Vrije Universiteit Amsterdam; De Boelelaan 1087 1081 HV Amsterdam Netherlands
2. The James Hutton Institute; Aberdeen UK
3. Institute for Transport Studies; University of Leeds; United Kingdom
4. University of Bologna; Bologna Italy
5. Research Institute of Water and Environmental Engineering (IIAMA); Universitat Politècnica de València; Valencia Spain
6. Faculty of Mechanical Engineering; University of Western Macedonia; Kozani Greece
7. Department of Agricultural Economics; Agricultural University of Athens; Greece
8. Business and Law; Central Queensland University; Rockhampton Queensland Australia