Our National Parks and the Search for Sustainability

A study of the US National Park Service's efforts to allow for as many visitors as possible in the parks that are kept in as natural a state as possible.

"Yosemite Valley in July of 1967 would have had to be seen to be believed. There was never an empty campsite in the valley; you had to create a space for yourself in a sea of cars, tents, and humanity. . . . The camp next to ours had fifty people in it, with rugs hung between the trees, incense burning, and a stereo set going full volume."