Ted Caplow

饰：Self - Mechanical & Environmental Engineer

Roscoe Bartlett

饰：Self - 7 Term Representative for the State of Maryland

Albert Bartlett

饰：Self - Prof. Emeritus of Physics: U of Colorado, Boulder

David Pimentel

饰：Self - Global Agriculturist

Max Wolff

饰：Self - Economist: GPIA New School University,(as Max Fradd Wolff)

Matt Savinar

Terry Tamminen

饰：Self - Former Head of the California EPA

William R. Catton

饰：Himself - Professor Emeritus of Sociology

Richard Heinberg

Richard Heinberg

饰：Self - Journalist, Educator

Joseph Tainter

Joseph Tainter

饰：Self - Anthropologist, Historian

James Hansen

James Hansen

饰：Self - Physicist, Astronomer

Derrick Jensen

Derrick Jensen

饰：Self - Activist

Kenneth Deffeyes

Kenneth Deffeyes

饰：Self - Geologist, Professor Emeritus Princeton University