From fisheries to persistent organic pollutants to climate change itself, no other environmental principle in environmental law has produced as much controversy as the precautionary principle. Unlike a preventive approach in which action is taken provided that the threats to the environment are tangible, with a precautionary approach, authorities are prepared to tackle risks for which there is no definitive proof that the damage will materialize. The ramifications of this increasingly apparent approach are profound and cut across all areas of risk assessment and management, environmental law,...