Since the first edition appeared over twenty years ago, this book has been a leader in the field. It covers all of the major federal environmental statutes, while introducing students to important overarching themes. Particular attention is given to the proper role of cost-benefit analysis, the appropriate judicial role in reviewing agency decisions, and the impact of constitutional decisions relating to federalism, standing, and takings. The Sixth Edition adds a greater emphasis on regulatory "reinvention" proposals and provides user-friendly overviews of the statutory frameworks. The revised introductory chapter provides a thorough grounding in theories of environmental regulation. The new edition also contains a completely new chapter on air pollution, featuring analysis of the Supreme Court's blockbuster decision in American Trucking on the role of cost in setting air standards and an explanation of the Bush Administration's initiatives. A new chapter on water pollution probes the "end of pipe" approach to water pollution for point sources and analyzes recent efforts to force states to address non-point source pollution. In short, the book provides students with a thorough understanding of existing regulatory schemes as well as insight into current policy controversies.