The overall goal of this project is to leverage existing knowledge, models and data to develop a framework for understanding the interplay between global change and local sustainability of US agriculture in the context of alternative national, state and local policies affecting agricultural productivity and environmental quality. In particular, we will examine the tradeoffs between: 1) crop production, prices and food consumption, 2) land use and associated carbon dioxide emissions, 3) groundwater depletion, and 4) nitrogen losses.   We are collaborating with scientists at Purdue University (lead PI Tom Hertel) and with Dr. Navin Ramankutty at the University of British Columbia.