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Those huge piles of rock salt you see on the sidewalk after a snow storm are more than just annoying white lumps. They’re damaging fresh waterways.
In-depth analysis and commentary on today's biggest news stories as only the BBC can deliver. BBC "Newshour" covers everything from the growth of democracy to the threat of terrorism with a fresh, clear perspective from across the globe.
Those huge piles of rock salt you see on the sidewalk after a snow storm are more than just annoying white lumps. They’re damaging fresh waterways.
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