FILE - In this March 6, 2017, file photo firefighter Travis Pohlman checks for hot spots in the trees in the Highlands in Hutchinson, Kan. A University of Nebraska study indicates that trees in Kansas are posing a mounting wildfire risk as they continue to take over grassland around the state. Initial research suggests a link between the spread of trees in the Great Plains and a rise in the size and frequency of large wildfires. (Lindsey Bauman/The Hutchinson News via AP, File)
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