New York uses a lot of salt, the standard solution for snowy roadways. A 2018 report says the salt has pushed chloride levels in the state’s freshwater streams up to about a quarter of the concentration in seawater and that the state spends about $1.6 billion a year on roadway deicing. Salt also chews up pavement. For years, engineers have been searching for a more environmentally friendly way of keeping highways clear.
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