In 2014, a home in Lehigh County, Pa., was found to have the highest radon level ever recorded in the United States. The concentration was more than 900 times greater than the U.S. Environmental Protection Agency's...

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The solar power industry announced its presence with blinding authority in 2016. For the first time in history, solar topped gas and wind as the top source of new electricity-generating capacity, which nearly doubled...

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