Nearly a century after his death, John Muir is remembered and revered as the father of the environmental movement, the father of conservation, and the founder of the Sierra Club. It was this Scottish-American who believed it was our responsibility as citizens to care for and protect our natural surroundings. He taught us by example and passion -- through his actions, his writings, his art -- how to do so. Through his tireless advocacy, he almost single-handedly saved the Yosemite Valley of California from destruction and was the force behind the creation of the National Parks Service. Filmed throughout the majestic, breathtaking landscapes and wilderness traveled by Muir those many years ago, this documentary places our nation's most important asset in a cultural and social context. Muir's story could not be a more timely reminder of America's unique and, ultimately, threatened eco-system.