Implementing EU emissions trading: success or failure?

This article assesses and explains the implementation of the EU emissions trading scheme (EU ETS). It argues that implementation in terms of ambitiousness has been only moderately successful so far, but significant differences between the Member States are also observed. Similarities and differences are then explained within a multi-level governance approach emphasizing the need to search for explanations at national, EU, and global levels. The EU ETS case shows that the multi-level governance approach can be as relevant for understanding implementation as for explaining policy-making. In addition to factors located at the national level, the decentralized nature of the EU scheme itself is important for understanding how the system works in practice. At the global level, the link to the Clean Development Mechanism under the Kyoto Protocol is particularly important for determining how well the EU ETS will perform in the future.