This book explores how compliance with international environmental law has changed over time, offering a critical analysis of its current shifting patterns. Beginning with an overview of compliance with international environmental law, the book goes on to explore in detail: compliance in the different legal regimes instituted by Multilateral Environmental Agreements (MEAs), the addition of new subjects of international law, the legal relations between developed and developing countries, and the emergence of new compliance mechanisms in global environmental law. The analysis takes two key developments into consideration: the evolution in forms of compliance and non-state involvement in compliance with international environmental law. In the final section, three case studies are provided to demonstrate how these changes have occurred in selected areas: climate change, biodiversity and water resources. Throughout the book, topics are illustrated with extracts from specific international environmental law jurisprudence and relevant international environmental law instruments. In doing so, the book offers a comprehensive analysis of compliance with international environmental law, providing original insights and following a clear and systematic structure supported by reference to the sources. This book will be of interest to professionals, academics and students working in the field of compliance with international environmental law.