Pepco has been making strides to improve reliability in D.C. since it's low point in the wake of the derecho storm in 2012. But with a merger with energy giant Exelon in the pipeline, some wonder whether that improvement is at-risk.
A recent National Geographic article looks at toxic waste sites in the U.S. and the more than 49 million Americans who live near them. NPR's Eric Westervelt talks with writer Paul Voosen about his piece.
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