Bjørn Lomborg

Character: Self - Director, Copenhagen Consensus Center

Hashem Akbari

Character: Self - Head of Heat Island Group, Berkeley Lab

Al Gore

Character: Self (archive footage)

James Hansen

Character: Self - Director, NASA Institute for Space Studies

Barack Obama

Character: Self (archive footage)

Barry Glassner

Character: Self - Sociologist, USC and Author, 'The Culture of Fear'

Richard Lindzen

Character: Self - Professor of Atmospheric Science, MIT

Nathan Myhrvold

Character: Self - Founder, Intellectual Ventures

Daniel Nocera

Character: Self - Professor of Energy and Chemistry, MIT

Thomas Schelling

Character: Self- Economist, Nobel Laureate

Jonathan Trent

Character: Self - OMEGA Project Scientist, NASA Ames Research Center

Joe Barton

Character: Self (archive footage)

John Dingell

Character: Self (archive footage)