A large and growing proportion of contemporary environmental regulation is transnational, which means that it is impossible to understand environmental governance without a firm grasp of the nature of transnational environmental regulation (TER). In this illuminating work, Veerle Heyvaert offers readers a comprehensive discussion of TER, including analysis of international environmental agreements, regional and EU regulation, private environmental regulation, and governance networks, arguing that TER is highly diverse but sufficiently cohesive to allow the identification of shared characteristics that establish TER as a model of regulation. The book uncovers the key features of TER, and analyses the various intentions of TER regulators, TER's governance principles and compliance strategies, using a newly developed activity-based methodology for regulatory analysis. This book should be read by anyone seeking to understand the strengths and weaknesses of transnational environmental governance and its contribution to sustainability.