Stephen Hawking: Climate Change Greatest Threat Facing Planet

Scientist Stephen Hawking described climate change Wednesday as a greater threat to the planet than .

Doomsdayclock Hawking made the remarks as other prominent scientists prepared to push the giant hand of the Doomsday Clock — a symbol of the risk of atomic cataclysm — closer to midnight. The move will mark the fourth time since the end of the Cold War that the clock has ticked forward and Hawking warned that "as citizens of the world, we have a duty to alert the public to the unnecessary risks that we live with every day."

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