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In this photo provided by the National Park Service a National Park Service staffer sets up an acoustic recording station on Going-to-the-Sun Road to capture the impact of traffic on acoustic conditions in Glacier National Park, Mont. The call of the wild is getting harder to hear. Peaceful natural sounds, bird songs, rushing rivers and rustling grass, are being drowned out by human-made noise in nearly two-thirds of America’s protected parks, forests and wilderness areas, a new study finds. (National Park Service via AP)

In this photo provided by the National Park Service a National Park Service staffer sets up an acoustic recording station on Going-to-the-Sun Road to capture the impact of traffic on acoustic conditions in Glacier National Park, Mont. The call of the wild is getting harder to hear. Peaceful natural sounds, bird songs, rushing rivers and rustling grass, are being drowned out by human-made noise in nearly two-thirds of America’s protected parks, forests and wilderness areas, a new study finds. (National Park Service via AP)

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