Earth keepers

A biography of the naturalist who founded the Sierra Club and was influential in establishing the national park system.

A biography of the author and conservationist who has been a key figure in such groups as Sierra Club and Friends of the Earth.

Examines the life and work of the politician who worked on the state and national level to protect the environment and was responsible for the first Earth Day in 1970.

Describes the life of the author who came to value the natural world and whose writings have influenced and inspired others concerning nature.