Kennette Benedict

饰：Herself - Executive Director, Bulletin of Atomic Scientists

Steven M. Block

饰：Himself - Professor of Biophysics, Stanford University

Robert R. Butterworth

饰：Himself - Trauma Psychologist

Clark Chapman

饰：Himself - Senior Scientist - Southwest Research Institute

Bethany Cobb

饰：Herself - Yale University

Charles David Dailyn

饰：Himself - Professor of Astronomy, Yale University

John Grattan

饰：Himself - Volcanologist, University of Wales

史蒂芬·霍金

Stephen Hawking

饰：Himself

Rita Haxton

饰：Herself - Rapid City Regional Hospital

Joseph Cirincione

Joseph Cirincione

饰：Himself - Arms Control Analyst - Center for American Progress

Hugo De Garis

Hugo De Garis

饰：Himself - Director - International Institute of Artificial Intel

Laurie Garrett

Laurie Garrett

饰：Herself - Senior Fellow - Council on Foreign Relations

艾伯特·戈尔

Al Gore

饰：Himself

James Hansen

James Hansen

饰：Himself - Director, NASA Goddard Institute

Susan Joy Hassol

Susan Joy Hassol

饰：Herself - Co-Author "Climate Change Impacts on the United States

加来道雄

Michio Kaku

饰：Himself - Professor of Theoretical Physics, City University of N

Bill McGuire

Bill McGuire

饰：Himself - Professor of Geohazards, University College London

Michael Rampino

Michael Rampino

饰：Himself - Professor of Earth Sciences, New York University

奈尔·德葛拉司·泰森

Neil Tyson

饰：Himself - Astrophysicist - American Museum of Natural History

伊莉莎白·巴尔加斯

Elizabeth Vargas

饰：Herself - Anchor

Kevin Warwick

饰：Himself - Professor of Cybernetics, University of Reading

尼尔·德格拉塞·泰森

Neil deGrasse Tyson

饰：自己

Kevin Nadal

饰：自己

詹姆斯·洛夫洛克

James Ephraim Lovelock

饰：自己

Irwin Redlener

饰：Self - Director - National Center for Disaster Preparedness - Columbia University,(as Irwin Redlener MD)