Transboundary Environmental Negotiation is an important collection of articles generated by faculty and graduate students at MIT, the Fletcher School of Law and Diplomacy at Tufts University, and the Program on Negotiation at Harvard Law School. The contributors emphasize the ways in which global environmental treaty-making can be improved. They highlight new environmental problems that pose difficult global negotiation challenges and suggest new strategies for involving a range of nongovernmental actors in ways that can overcome the obstacles to transboundary environmentalism.