Warming Lake (IMAGE) Brown University Caption Researchers drilled cores into Lake Tanganyika to document the lake’s surface temperature for the last 1,500 years. They found unprecedented warming in the 20th century. Brown geologist James Russell, kneeling at drill head, led this core sampling mission in 2004. Credit Kate Whittaker 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.