Lake Sediment Core (IMAGE) University of California - Riverside Caption Researcher Peter Homyak is seen here collecting a lake sediment core to study the impacts of air pollution and climate change on alpine lakes of the Sierra Nevada. Credit Sickman Lab, UC Riverside. 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.