The signs of a warming planet are everywhere here in Grand Teton National Park. With retreating glaciers, lakes depleted by drought and forests parched by hotter temperatures, climate change is upending one of the great intact ecosystems in North America.
After more than a century of trying to preserve some of the world's most wondrous natural landscapes, the National Park Service in recent years has shifted its mission away from absolute conservation.
These things are happening so quickly, and they're being sped up by all the human activity, said Kirk Ryder, a longtime nature guide in the area.
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