Mud Layers (IMAGE) Columbia Climate School Caption Sediments deposited by ice sheet meltwater provide clues about ancient climates, as well as the future effects of global warming. Credit Francesco Muschitiello Usage Restrictions Credit must be given 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.