Study author (IMAGE) University of Bonn Caption In his doctoral thesis, Felix Holtkamp from the University of Bonn investigated processes that can be used to reduce methane emissions from slurry. Credit Photo: Felix Holtkamp / University of Bonn Usage Restrictions Please use this picture only in connection with the press release. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.