Hallet Lake (IMAGE) University of Arizona Caption Hallet Lake, near the crest of the Chugach Mountain Range in south-central Alaska. Productivity in the lake is sensitive to summer temperature in the region. Researchers used sediment cores from Hallet Lake and others to construct a 2,000-year climate record for the Arctic. Credit Copyright 2006 Nicholas P. McKay Usage Restrictions This photo may only be used to illustrate a story about the research described in the accompanying news release, "Recent Arctic Warming Reverses Millennia-long Cooling Trend." Please make sure to credit the photo as requested. Do not post this photo independent of the story. 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.