The Washington Post | By: Brady Dennis | January 08, 2018:
This map (above) shows changes in the salt content of fresh water in rivers and streams across the United States over the past half-century. Warmer colors indicate increasing salinity, while cooler colors indicate decreasing salinity. The black dots represent the 232 U.S. Geological Survey monitoring sites that provided the data for a new study. (Image Credit: Ryan Utz/Chatham University)
Nearly everywhere you turn during this frigid stretch of winter, much of the world seems covered in a layer of salt aimed at keeping our roads drivable and sidewalks free of ice.
All that salt is one reason — although not the only one — that many of the nation’s rivers and streams are becoming saltier, according to new research published Monday in the Proceedings of the National Academy of Sciences.
Increased salt poses risks to drinking-water supplies for millions of Americans, threatens urban infrastructure, and has the potential to upend ecosystems.
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