FILE - In this June 22, 2016 file photo, a sign warning of extreme heat is seen on a trailhead at Piestewa Peak in Phoenix. Thirty-one of the country’s top science organizations are telling Congress that global warming is real, a problem and something needs to be done about it. The science groups, which represent millions of scientists, sent the letter Tuesday, June 28, 2016, saying the severity of climate change is increasing and will get worse faster in coming decades. (AP Photo/Matt York, File)
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