Grand Canyon Stretch of Colorado River Threatened by Mercury Pollution

EcoWatch: Even one of America`s most iconic landmarks is not immune from pollution. The Grand Canyon segment of the Colorado River is suffering from exposure to toxic chemicals, including mercury, according to a study from the U.S. Geological Survey (USGS). In Grand Canyon reach of CO River, some fish have toxic mercury levels @caryinstitute @USGS -- Cary Institute (@caryinstitute) August 19, 2015 "Concentrations of mercury and selenium in Colorado......

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