John Muir is the patron saint of environmentalism, an epic figure whose writings of mystical enlightenment attained during lone treks in California's wilderness glorified individualism, saved Yosemite and helped establish the national park system.

As the first president of the Sierra Club, Muir shaped enduring perceptions about how the wild world should be prioritized, protected and managed.

But now some critics are arguing that the world has changed so much in the century since his death that Muir has gone the way of wheelwrights.