A critical overview of the application of the precautionary principle.This overview of the application of the controversial precautionary principle in a number of legal systems identifies a set of problems with its use by decision-makers and courts and advocates a more rational approach to risk regulation.This overview of the application of the controversial precautionary principle in a number of legal systems identifies a set of problems with its use by decision-makers and courts and advocates a more rational approach to risk regulation.A topical overview of the legal definition of the precautionary principle, notably in relation both to European Community law and to international law, with special reference in the latter to the WTO regime and international environmental law. The author then goes on to offer a more detailed study of its application within three specific regulatory regimes within the United Kingdom, the United States and Sweden.1. Introduction; 2. Risk and uncertainty: basic concepts and tools for the application of the precautionary principle; 3. The precautionary principle in international law; 4. The precautionary principle in EC law; 5. The precautionary principle in Sweden; 6. The precautionary principle in the United Kingdom; 7. The precautionary principle in the United States; 8. Conclusions.'This book has advanced our understanding of the legal scope and application of the principle and is an essential text for environmental lawyers and practitioners as well as researchers, policy makers and students with an interest in environmental and public health regulation.' Environmental Liability'Zander's proposal hits the nail on the head.' The Cambridge Law Journal