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Science certainty and global warming

Sir Richard Branson of Virgin Atlantic (L) and designer Burt Rutan (R) stand under a model of the Virgin Galactic spaceship which will carry passengers to space
Sir Richard Branson of Virgin Atlantic (L) and designer Burt Rutan (R) stand under a model of the Virgin Galactic spaceship which will carry passengers to space
Photo by Spencer Platt/Getty Images
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