If you ski Alta this winter, you may notice that the 51-year-old Watson Shelter has been replaced by a new structure. So what happened to the old refuge, with its scrumptious, juicy burgers? Turns out it was more eco-friendly to torch the place than haul it away. So last June, Alta staffers set the building on fire. "We didn't use fuel," says Alta's Connie Marshall. "There was enough grease on the walls-it just went up in smoke."