1. Department of Science and Technology Universidade Aberta Lisbon Portugal
2. CENSE, Center for Environmental and Sustainability Research, NOVA School of Science and Technology NOVA University Lisbon Caparica Portugal
3. Department of Economic Studies University “G. d'Annunzio” – Pescara Chieti Italy
4. Copernicus Institute of Sustainable Development Utrecht University Utrecht the Netherlands
5. Department of Economics University of Messina Messina Italy