Based on an innovative theoretical framework combining theories of EU policymaking, negotiation and implementation, this comprehensive book examines EU climate and energy policies from the early 1990s until the adoption of new policies for 2030. The authors investigate how the linking of climate and energy concerns in policy packages has facilitated agreement among EU leaders with very different policy ambitions. Employing in-depth studies from a diverse range of energy-economic countries, the book also explores the impact of domestic policy implementation experiences on the 2030 climate and energy policy framework and the Energy Union initiative. Social scientists and researchers in EU climate and energy policies will find the new empirical data and theoretical approach useful to their work. Students of the social sciences and politics will also benefit from the accessible overview of EU climate and energy policy development. This book will also be of interest to private and public decision-makers looking for explanations for the causes and consequences of EU climate and energy policy development.