Transboundary Policy Challenges responds to a growing interest in borderlands environmental policy by highlighting significant transboundary research and practices being undertaken within and across the Pacific border regions of North America. The issues explored here reveal how intricate and interrelated social, economic, and environmental concerns have become, particularly along borders, as Canada, Mexico, and the United States collectively search for sustainable solutions. Growing concern about the seriousness of environmental problems, particularly in high-growth border areas, coupled with the rising awareness of the complexities entailed in wise development decisions, has spurred recognition that new realities require new responses. Critical for effective environmental protection, restoration, and education is a sharing of understanding and effort across borders. Transboundary Policy Challenges highlights advances in transborder environmental research and discusses sensible policy directions with particular focus on critical areas of international concern and engagement: land and water use planning; regional growth management; trade and transportation corridors; environmental education; and travel and tourism.