When a chemical spill leaked into West Virginia's Elk River last week, people were warned not to drink, cook or even wash their clothes in the water. NPR's Lynn Neary speaks with James Salzman, author of the book Drinking Water: A History, about the fairly recent history of the government regulating drinking water.
As world leaders gather in Paris to talk about climate change, one phrase that will dominate conversations is "two degrees." Global leaders will discuss how to prevent global temperatures from warming by more than two degrees since the industrial revolution.
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