1. Department of Economics and Economic History and IME Multidisciplinary Business Institute, Universidad de Salamanca, C/Francisco Tomás y Valiente s/n, 37007 Salamanca, Spain
2. Euro-Mediterranean Center on Climate Change, RAAS Division, Via della Libertà, 12, 30121 Venezia, Italy
3. Duero River Basin Authority, C/Muro, 5, 47004 Valladolid, Spain