Bjørn Lomborg
Self - Director, Copenhagen Consensus Center
Hashem Akbari
Self - Head of Heat Island Group, Berkeley Lab
Al Gore
Self (archive footage)
James Hansen
Self - Director, NASA Institute for Space Studies
Barack Obama
Self (archive footage)
Barry Glassner
Self - Sociologist, USC and Author, 'The Culture of Fear'
Richard Lindzen
Self - Professor of Atmospheric Science, MIT
Nathan Myhrvold
Self - Founder, Intellectual Ventures
Daniel Nocera
Self - Professor of Energy and Chemistry, MIT
Thomas Schelling
Self- Economist, Nobel Laureate
Jonathan Trent
Self - OMEGA Project Scientist, NASA Ames Research Center
Joe Barton
Self (archive footage)
John Dingell
Self (archive footage)