High Lake, Alaska (IMAGE) University of Washington Caption The chemical fingerprint of nitrogen pollution has been recorded for more than a century in High Lake, Southwest Alaska, and 24 other remote lakes in the Northern Hemisphere. Credit Patrick Walsh/ US Fish and Wildlife Service Usage Restrictions Image credit required 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.