Snowmobiles in Yellowstone
385525 08: A tourist riding a snow machine slows down to photograph the sunset February 10, 2001 in Yellowstone National Park. About 55,000 snowmobiles enter the park each winter causing environmental damage. The National Park Service will phase out snowmobile use in Yellowstone and Grand Teton national parks over the next three years. (Photo by Michael Smith/Newsmakers)
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