Colorado's ski resorts are trying to protect their most precious commodity: snow. Operators say climate change threatens to devastate their business. That's why all of Colorado's 26 ski resorts have launched green initiatives. Dan Meyers talks to Geraldine Link, director of public policy for the Lakewood-based National Ski Areas Association, and Ben Doon, research director for the Ski Area Citizens' Coalition, which grades Colorado’s resorts on their environmental performance.