Cleveland, David A. (Department of Anthropology and the Environmental Studies Program, University of California, Santa Barbara 93106-3210, USA, clevelan@lifesci.ucsb.edu), Daniela Soleri (Office of Arid Lands Studies, University of Arizona, 1955 E 6th St, Tucson, AZ 85719, USA; current address, Center for People, Food and Environment, 340 Arboleda, Santa Barbara, CA 93110, USA, and Institute fo...