This volume complements Shared Space: Rethinking the U.S.-Mexico Border Environment, edited by Lawrence Herzog and Environmental Management on North America’s Borders, edited by Richard Kiy and John Wirth. This volume expands the range of issues addressed in previous volumes as well as focuses on comprehensive assessments of cooperative efforts of the U.S. and Mexico to solve environmental problems. All environmental media are addressed along the border: land, air, water, as well as sources of pollution (transportation, agriculture, energy, industrial production, urban growth, hazardous waste generation) and biodiversity resources (migratory aquatic and terrestrial forest and insect species). Academic, government, environmental management and policy audiences can benefit from the volume to address environmental policy for borders around the world because the chapters integrate natural science and social science theory, analytical methods and data into the arena of international environmental policy analysis.