| BBjørn LomborgSelf - Director, Copenhagen Consensus Center | Self - Director, Copenhagen Consensus Center |
| HHashem AkbariSelf - Head of Heat Island Group, Berkeley Lab | Self - Head of Heat Island Group, Berkeley Lab |
 Al GoreSelf (archive footage) | Self (archive footage) |
 James HansenSelf - Director, NASA Institute for Space Studies | Self - Director, NASA Institute for Space Studies |
 Barack ObamaSelf (archive footage) | Self (archive footage) |
| BBarry GlassnerSelf - Sociologist, USC and Author, 'The Culture of Fear' | Self - Sociologist, USC and Author, 'The Culture of Fear' |
 Richard LindzenSelf - Professor of Atmospheric Science, MIT | Self - Professor of Atmospheric Science, MIT |
| NNathan MyhrvoldSelf - Founder, Intellectual Ventures | Self - Founder, Intellectual Ventures |
| DDaniel NoceraSelf - Professor of Energy and Chemistry, MIT | Self - Professor of Energy and Chemistry, MIT |
| TThomas SchellingSelf- Economist, Nobel Laureate | Self- Economist, Nobel Laureate |
| JJonathan TrentSelf - OMEGA Project Scientist, NASA Ames Research Center | Self - OMEGA Project Scientist, NASA Ames Research Center |
 Joe BartonSelf (archive footage) | Self (archive footage) |
 John DingellSelf (archive footage) | Self (archive footage) |