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