This is a book about the psychology of environmental law. Psychology can affect environmental legal doctrine and institutions by affecting how people perceive, respond to, value, and make decisions about the environment. Where environmental law fails to incorporate insights from psychology, it risks misunderstanding and mispredicting human behaviors that injure and affect the environment, and misprescribing legal tools to shape those behaviors. Yet there is no robust tradition of psychological analysis within environmental law. This book is intended to help change that, by sparking and supporting discussion about how psychology can inform, explain, and improve how environmental law operates. It begins by identifying what is distinctively psychological about environmental law, arguing that many of the characteristics that make environmental injury distinctive also implicate distinctive psychological phenomena, and understanding those phenomena can help in crafting, enforcing, and understanding the impact of laws that seek to manage environmental injury. In particular, it suggests that the distinctively diffuse, complex, and nonhuman character of environmental injury has psychological as well as legal implications. The book then explores the payoff of applying a psychological analysis to environmental law, exploring the policy, practical, and doctrinal implications of psychology in pollution control, ecosystem management, and climate change law and policy.