Vail, Colorado
Credit: Patrick Orton / Getty Images

A 20 percent decline in the Rockies' snow cover since 1980 has led to increased wildfires, and warmer temperatures to an infestation of pine beetles that has decimated millions of acres of forest.

What they're doing: Vail operates a cloud-seeding project that officials say has added to the annual snowfall and helped replenish the water supply.