1. Department of Methods and Models for Economics, Territory and Finance, Faculty of Economics, Sapienza University of Rome, Via del Castro Laurenziano 9, I-00161 Rome, Italy
2. Department of Regional and Economic Development, School of Applied Economics and Social Sciences, Agricultural University of Athens (AUA), 33100 Amfissa, Greece
3. Department of Sociology, University of the Aegean, 81100 Mitilini, Greece
4. Soil Erosion and Degradation Research Group, Department of Geography, University of Valencia, Blasco Ibàñez, 28, ES-46010 Valencia, Spain
5. Department of Social and Economic Science, Polytechnic University of Marche, Piazzale Martelli 8, I-60121 Ancona, Italy
6. Department of Social Sciences and Economics (DISSE), Faculty of Political Sciences, Sapienza University of Rome, Piazzale A. Moro 5, I-00185 Rome, Italy
7. Planning and Design Faculty, Agricultural University of Iceland, Hvanneyri, 311 Borgarbyggð, Iceland