Even the Bottom of the Grand Canyon is Now Contaminated

Posted by Washington Post: Juliet Eilperin on August 31st, 2015
National Geographic: By almost any calculation, the Colorado River at the bottom of the Grand Canyon is one of the most isolated places in the contiguous United States. Although about half a million people a year hike Grand Canyon trails, only a tiny fraction of them make the arduous trek to the bottom, almost a mile from the surface. One might think that this inaccessibility protects the river's unique ecosystems. But that's wrong, says David Walters, lead author of new research conducted by the U.S. Geological Survey.......

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