Christopher A. Scott is director of the Udall Center for Studies in Public Policy, professor in the School of Geography and Development, and director of the Consortium for Arizona-Mexico Arid Environments at the University of Arizona. He chairs the Consensus Study on U.S.-Mexico Drylands of the two countries’ national academies of science.


The year 2019 marked a significant milestone in U.S.-Mexico hydrodiplomacy: seventy-five years since the two countries adopted the Treaty of 1944, which apportioned between them the waters of the Rio Grande, Colorado River, and Tijuana River.