National Parks visits could rise and fall as temps warm

Climate Central: The number of people going to witness the eruption of Old Faithful or gawk at the grandeur of the Grand Canyon could go up along with the steady rise of overall temperatures driven by the buildup of heat-trapping greenhouse gases in Earth's atmosphere, a new study finds. But only to a point: Once temperatures reach a certain threshold, park visits could actually decline, the research shows. That could mean fewer park goers in the hot summer months, and perhaps a shift to the milder fall and spring......

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