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News From the Field

Nitrogen From Humans Pollutes Remote Lakes for More Than a Century


December 15, 2011

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Nitrogen derived from human activities has polluted lakes throughout the Northern Hemisphere for more than a century and the fingerprint of these changes is evident, even in remote lakes located thousands of miles from the nearest city, industrial area or farm. The findings are based on historical changes in the chemical composition of bottom deposits in lakes using an approach similar to aquatic archaeology. Photo by Patrick Walsh, U.S. Fish and Wildlife ServiceFull Story

Source
University of Washington

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