Concentrations of Methane (IMAGE) University of Bristol Caption Concentrations of methane simulated in the atmosphere (left) and the major sources of emissions (right). Credit Matt Rigby, University of Bristol Usage Restrictions None License Licensed 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.