ADVANCE FOR SATURDAY, DEC. 30 -In this Wednesday, Dec. 6, 2017, photo, Colorado State University student Ben Buescher works in a laboratory at the college to chart noise pollution from recordings made in the nation's national parks, in Fort Collins, Colo. The college's listening lab analyzes recordings from the nation's parks in an effort to combat man-made noise pollution. (Sam Brasch/Colorado Public Radio via AP)
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