Bjørn Lomborg

as Self - Director, Copenhagen Consensus Center

Hashem Akbari

as Self - Head of Heat Island Group, Berkeley Lab

Al Gore

as Self (archive footage)

James Hansen

as Self - Director, NASA Institute for Space Studies

Barack Obama

as Self (archive footage)

Barry Glassner

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

Richard Lindzen

as Self - Professor of Atmospheric Science, MIT

Nathan Myhrvold

as Self - Founder, Intellectual Ventures

Daniel Nocera

as Self - Professor of Energy and Chemistry, MIT

Thomas Schelling

as Self- Economist, Nobel Laureate