The European Union (EU) is an influential actor in environmental politics and policy-making across its 28 member states, around its periphery, and globally. Building on a diverse literature, this article examines European environmental policy-making and implementation since the 1970s. The first section discusses the evolution of the EU legal basis through treaty reforms for making environmental policy and seeking sustainable development. This is followed by a review of main actors in EU environmental politics and discussion of EU environmental policymaking and implementation. Subsequent sections assess EU environmental politics in the context of membership enlargements and examine EU international engagement with multilateral fora and other...