Yellowstone Park: Snowmobile Capitol of the World?

Over the tranquil blanket of snow in Yellowstone Park, a noisy new trend has emerged. Tens of thousands of snowmobilers comes to gape at the scenery. But cross-country skiers and other more traditional nature observers are disturbed by the noise, fumes and disruption they say these tourists bring. Jyl Hoyt from member station KBSU reports.