Jeff Bridges

as Self - Narrator (voice)

Piers Sellers

as Self - NASA Astronaut & Research Scientist

Wesley Clark

as Self - General, US Army (ret.); Former NATO Supreme Allied Cmdr.

Oren R. Lyons

as Self - Dist Prof of American Studies, Onondaga Council of Chiefs

Timothy Morton

as Self - Philosopher & Author, 'Humankind'

Bob Inglis

as Self - Former Congressman (R), South Carolina

Rich Pancost

as Self - Professor of Biogeochemistry

Ruth Gates

as Self - Marine Biologist; Dir. Hawaii Institute of Marine Biology

Renée Lertzman

as Self - Author, ‘Environmental Melancholia’

Leonard Mlodinow

as Self - Physicist