Limestone outcrop (IMAGE) University of Bonn Caption Limestone outcrop on the Taymyr Peninsula in North Siberia, in one of the areas where increased methane concentrations appeared in summer 2020. Credit © Dmitry Zastrozhnov 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.