1.Introduction to the joint research project CLEAN: CO2 Large-scale Enhanced gas recovery in the Altmark Natural gas fields -- 2. Technical Aspects of CO2 Injection -- 3.Well Integrity -- 4. Evaluation of Geo-Processes -- 5. Reservoir and Cap Rock Monitoring -- 6. Environmental and Process Monitoring -- 7. Theoretical test case of the injection of 100,000 t of CO2 into the Altmark depleted gas field -- 8. Public Outreach.

The project CLEAN (CO2 Large-Scale Enhanced Gas Recovery in the Altmark Natural Gas Field) provides site specific knowledge for a potential future pilot project. This contributed volume gives an overview and final results of the entire project which is finalized to the end of 2012.