The new edition of this innovative coursebook has been thoroughly updated and revised. The problem orientation of the first two editions has been retained, along with the detailed doctrinal exploration of international law that permits the book to be used in either an introductory international law course or an advanced class or seminar on environmental problems. Highlights of the third edition include expanded coverage of climate change; extensive use of international cases to illustrate key legal doctrines and concepts; and a new chapter that explores the concept of ecological commons governance and its significance for the future of international environmental law. Most of the problems in the book have been revised extensively, with entirely new problems on whaling, geoengineering, electronic waste exports, chemical exports (DDT and asbestos), environmental trade restrictions, nuclear safety, transboundary air pollution, biodiversity and more.