1. Introduction Part 1: The Role of the European Commission in Enforcing EU Environmental Law 2. EU Institutional Enforcement of EU Environmental Law - The General Legal Framework 3. Enforcement Proceedings Brought by the European Commission (1) 4. Enforcement Proceedings Brought by the European Commission (2) 5. Enforcement Proceedings Brought by the European Commission (3) Part 2: The Role of Private Persons in Enforcing EU Environmental Law 6. Enforcement of EU Environmental Law at National Level by Private Persons: General Legal Principles 7. Access to Justice at National Level for Breaches of EU Environmental Law: The Role of the Court of Justice of the EU 8. Access to Justice at National Level for Breaches of EU Environmental Law: EU Legislation on Access to National Courts and Environmental Information 9. Private Enforcement of EU Environmental Law at EU Institutional Level: Access to Justice and Information 10. Private Enforcement of EU Environmental Law at EU Institutional Level: Administrative Complaints Procedures and Other Possibilities 11. Complaints by Private Persons against EU Member States: Implications for EU Environmental Law Enforcement 12. Complaints by Private Persons against EU Institutional Conduct: Implications for EU Environmental Law Enforcement Part 3: The Role of Member States in Enforcing EU Environmental Law 13. Enforcement of EU Environmental Law by National Authorities: General Principles and Environmental Inspection Responsibilities 14. Enforcement of EU Environmental Law by National Authorities: Environmental Civil Liability 15. Enforcement of EU Environmental Law by National Authorities: Environmental Criminal Liability 16. EU Environmental Law Enforcement: Reflections