Walking the Pacific Crest and Continental Divide Trails and a few others thrown in for good measure, Andrew Skurka is wrapping it up today at the Grand Canyon. His goal: documenting the effects of global warming on the wild places of the West.

“The reality is that change has already taken place that has potentially catastrophic consequences. There was a drastic difference in the size of the glaciers on my map and the size of glaciers right in front of me. The snowmelt is shocking,