Jeff Bridges

Self - Narrator (voice)

Piers Sellers

Self - NASA Astronaut & Research Scientist

Wesley Clark

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

Oren R. Lyons

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

Timothy Morton

Self - Philosopher & Author, 'Humankind'

Bob Inglis

Self - Former Congressman (R), South Carolina

Rich Pancost

Self - Professor of Biogeochemistry

Ruth Gates

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

Renée Lertzman

Self - Author, ‘Environmental Melancholia’

Leonard Mlodinow

Self - Physicist

Bruce Hood

Self - Prof of Developmental Psychology, Univ of Bristol, UK

Mark Plotkin

Self - Ethnobotanist, Amazon Conservation Team

Amy Jacobson

Self - Evolutionary Anthropologist, Human Behavioral Ecologist

Daniel Goleman

Self - Psychologist, Science Journalist, Author

Stephan Lewandowsky

Self - Professor of Cognitive Psychology, University of Bristol

Nate Hagens

Self - Director, Instit. for the Study of Energy & Our Future

Joseph Tainter

Self - Professor of Anthropology, Author

Ugo Bardi

Self - Prof of Physical Chemistry, Univ of Florence, Italy

Paul Roberts

Self - Journalist; Author, 'The Impulse Society'

Ian Robertson

Self - Cognitive Neuroscientist, Trinity College, Univ of Dublin