 "Earth Days" combines personal testimony and archival media.The film reviews the development of the modern environmental movement—from the post-war 1950s and the 1962 publication of Rachel Carson’s bestseller "Silent Spring", to the successful Earth Day celebration in 1970.Featured pioneers of the era include the former United States Secretary of the Interior Stewart Udall; biologist Paul Ehrlich, author of "The Population Bomb"; "Whole Earth Catalog" founder Stewart Brand; Apollo 9 astronaut Rusty Schweickart; "The Forecaster" Dennis Meadows, scientist and Emeritus Professor of Systems Management; and "The Politician" Pete McCloskey, former Republican.