California's current extreme drought must be a lesson for managing water in a warmer, more densely populated world, say Amir AghaKouchak and colleagues. ... Amir AghaKouchak is an assistant professor in the Center for Hydrology and Remote Sensing, ... David Feldman is a professor in the Department of Planning, Policy and Design, ...and Travis Huxman is a professor in the Department of Ecology and Evolutionary Biology [at UCI.]