1. Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, c/ José Antonio Nováis, 124, 28040 Madrid, Spain
2. Institute for Water and Watersheds, 210 Strand Agriculture Hall, Oregon State University, Corvallis, OR 97331-2208, USA
3. Edmund A. Walsh School of Foreign Service, Georgetown University ICC 514, 37th & O Streets NW, Washington, DC 20057, USA
4. School of Public Policy, 300E Gilkey Hall, Oregon State University, Corvallis, OR 97331-6206, USA
5. Lapham Hall S364, University of Wisconsin-Milwaukee, PO Box 413, Milwaukee, WI 53201, USA
6. College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, 104 CEOAS Administration Building, Corvallis, OR 97331-5506, USA