Kevin Fedarko is a writer, journalist and river guide explores the interface between wilderness and industrialization, most recently through the lens of the Grand Canyon. Fedarko recently published "A Walk In the Park," the story of his somewhat ill-conceived but ultimately successful quest to walk the trail-less expanse of desert wilderness that hides beneath the canyon's rims. We talk about the struggle to tell a story about the Colorado and the canyon that contains it that avoids the conventional morality tale of environment good, technology bad; the astonishing feat of engineering, unseen since the Great Pyramids that holds back Lake Powell; the punishment of untrailed nature; and the mythology of science, man as an island, and the wilderness as something we both crave and fear.