杰夫·布里吉斯
饰 Self - Narrator (voice)
Piers Sellers
饰 Self - NASA Astronaut & Research Scientist
韦斯利·克拉克
饰 Self - General, US Army (ret.); Former NATO Supreme Allied Cmdr.
Oren R. Lyons
饰 Self - Dist Prof of American Studies, Onondaga Council of Chiefs
Timothy Morton
饰 Self - Philosopher & Author, 'Humankind'
Bob Inglis
饰 Self - Former Congressman (R), South Carolina
Rich Pancost
饰 Self - Professor of Biogeochemistry
Ruth Gates
饰 Self - Marine Biologist; Dir. Hawaii Institute of Marine Biology
Renée Lertzman
饰 Self - Author, ‘Environmental Melancholia’
Leonard Mlodinow
饰 Self - Physicist
Bruce Hood
饰 Self - Prof of Developmental Psychology, Univ of Bristol, UK
Mark Plotkin
饰 Self - Ethnobotanist, Amazon Conservation Team
Amy Jacobson
饰 Self - Evolutionary Anthropologist, Human Behavioral Ecologist
Daniel Goleman
饰 Self - Psychologist, Science Journalist, Author
Stephan Lewandowsky
饰 Self - Professor of Cognitive Psychology, University of Bristol
Nate Hagens
饰 Self - Director, Instit. for the Study of Energy & Our Future
Joseph Tainter
饰 Self - Professor of Anthropology, Author
Ugo Bardi
饰 Self - Prof of Physical Chemistry, Univ of Florence, Italy
Paul Roberts
饰 Self - Journalist; Author, 'The Impulse Society'
Ian Robertson
饰 Self - Cognitive Neuroscientist, Trinity College, Univ of Dublin
