Juli 24, 2017

FILE – In this Sunday, June 7, 2015 file photo provided by the Alaska Division of Forestry, smoke rises from the Bogus Creek Fire, one of two fires burning in the Yukon Delta National Wildlife Refuge in southwest Alaska. Global warming is carving measurable changes into Alaska, and President Barack Obama is about to see it. President Obama leaves Monday, Aug. 31, 2015 for a three-day visit to the 49th state in which he will speak at a State Department climate change conference and become the first president to visit the Alaska Arctic. There and even in the sub-Arctic part of the state, he will see the damage caused by warming, damage that has been evident to scientists for years. (Matt Snyder/Alaska Division of Forestry via AP, File )

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