Ben Orlove is Professor of Environmental Science and Policy at the University of California, Davis and Adjunct Senior Research Scientist at the International Research Institute for Climate and Society at Columbia University. His books include Lines in the Water: Nature and Culture at Lake Titicaca (UC Press). Ellen Wiegandt is Lecturer at the Graduate Institute for International Studies in Geneva and Senior Researcher at the University Institute Kurt Bösch, Sion, Switzerland. She is also the editor of Mountains: Sources of Water, Sources of Knowledge. Brian H. Luckman is Professor of Geography at the University of Western Ontario, London, Canada.