Leonardo DiCaprio
Himself - Narrator
Kenny Ausubel
Himself
Sylvia Earle
Herself
John Trudell
Himself
Wangari Maathai
Herself
Oren R. Lyons
Himself
David Suzuki
Himself
Stephen Hawking
Himself
Janine Benyus
Herself
Gloria Flora
Herself
Michel Gelobter
Himself