Robert Marshall, Aldo Leopold and Howard Zahniser dedicated their lives to protect the shrinking American wilderness.
Vivid memories of those trapped in the terrifying temblor of 1906 that killed thousands of Californians.
A personal story of one family's dramatic effort to hold onto their family farm in Iowa as massive foreclosures sweep the nation in the 1990s.
Her 1963 warnings about the effects of pesticides and herbicides sparked a revolution in environmental policy.
The New Deal program CCC put three million young men to work in camps across America.
In 1934, American polar explorer Richard Byrd became the first to experience winter in Antarctica's interior.
John Wesley Powell's epic journey into the unknown Grand Canyon was filled with adventure as his team mapped the Colorado River for the first time.
Native Alaskans, oil company representatives, environmentalists, politicians, and others tell the story of the 800-mile pipeline.