Elenco (na ordem dos créditos)
Simon Poland
Narrator
David Attenborough
Self
Roger Payne
Chadden Hunter
Huw Cordey
Wangari Maathai
Rowan Williams
James Lovelock
Jonathon Porritt
M. Sanjayan
James Leape
Jeffrey A. McNeely
Mark Linfield
Alastair Fothergill
Martin Palmer
Tony Juniper
Nisar Malik
Craig Packer
E.O. Wilson
Peyton Knight
Sakana Ole Turede
Carlos Quesada
Henry Ndede
Robert May
Robert Watson
Adam Ravetch
Mark Brownlow
Clare Short
Russell A. Mittermeier
Martyn Colbeck
Johan Eliasch
Ulises Blanco
Ahmed Djoghlaf
Mark Stanley Price
Betsy Dresser
Sandra Postel
James Connaughton
Moisés León
Tony Martin
Richard Mabey
Barbara Maas
David Greer
E.J. Milner-Gulland
Simon Evans
Robert Costanza
Marek Kryda
Jan Kees Vis
Neville Ash