Historic Nitrate Levels Still Plague U.S. Rivers

ENN
Oct 29, 2015, 7:16 am49 pts
During 1945 to 1980, nitrate levels in large U.S. rivers increased up to fivefold in intensively managed agricultural areas of the Midwest, according to a new U.S. Geological Survey study. In recent decades, nitrate changes have been smaller and levels have remained high in most of the rivers studied.

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