This volume complements Shared Space: Rethinking the US-Mexico Border Environment , edited by Lawrence Herzog and Environmental Management on North America’s Borders , edited by Richard Kiy and John Wirth. It expands the range of issues addressed in previous volumes as well as focusing on comprehensive assessments of co-operative efforts of the US 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 should 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.