Introduction; Part I. The EU Legal and Institutional Framework After Lisbon: 1. The formalities and substance of EU external environmental competence: stuck between climate change and competitiveness H. H. B. Vedder; 2. Coherence and EU external environmental policy M. Cremona; 3. The post-Lisbon institutions and EU external environmental policy C. Damro; 4. The EU's representation in multilateral environmental negotiations after Lisbon M. Buck; 5. A Member State's perspective on the post-Lisbon framework for the EU's representation in multilateral environmental negotiations J. Thomson; Part II. Insights Into EU Practice: 6. Climate change in EU external relations: please follow my example (or I might force you to) K. Kulovesi; 7. EU external action on forests: FLEGT and the development of international law A. Savaresi; 8. Environmental integration in EU trade policy: the Generalised System of Preferences, trade sustainability impact assessments and free trade agreements R. Žvelc; 9. Environmental integration in EU development cooperation: responding to international commitments or its own policy priorities? G. Marín Durán; 10. The trajectory of EU biodiversity cooperation: supporting environmental multilateralism through EU external action E. Morgera; Part III. The EU and International Environmental Law: 11. The human rights dimension of environmental protection in EU external relations post-Lisbon D. Augenstein; 12. The EU and compliance mechanisms of multilateral environmental agreements: the case of the Aarhus Convention A. Alì; 13. Joint responsibility between the EU and Member States for non-performance of obligations under multilateral environmental agreements A. Nollkaemper; 14. Controversial aspects of the interaction between international and EU law in environmental matters: direct effect and Member States' unilateral measures R. Pavoni; Conclusions E. Morgera.