1. Results of the discussions on closer co-operation in European environmental policy

2. Closer co-operation in European environmental policy

3. Differentiated integration in the European treaties

4. Environmental guarantee and other options of "flexible" European environmental policy

5. Environmental chances and risks of European union-enlargement

6. Structure of closer co-operation in the treaties

7. Dealing with flexibility in the intergovernmental conference

8. "Emergency brake" - Political implications of the veto in the context of closer co-operation

9. Closer co-operation for European environmental policy

10. An energy tax for Europe?

11. Annex