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WASHINGTON, DC - JANUARY 26: Members of the Bulletin of Atomic Scientists deliver remarks on the 2017 time for the 'Doomsday Clock' January 26, 2017 in Washington, DC. For the first time in the 70-year history of the Doomsday Clock, the Bulletin of Atomic Scientists moved the clock forward 30 seconds to two and a half minutes before midnight, citing 'ill-considered' statements by U.S. President Donald Trump on nuclear weapons and climate change, developments in Russia, North Korea, India and Pakistan. From left to right are Executive Director and Publisher of the Bulletin of the Atomic Scientists Rachel Bronson, theoretical physicist Lawrence Krauss, former U.S. Ambassador to the United Nations Thomas Pickering and retired U.S. Navy Rear Admiral David Titley. (Photo by Win McNamee/Getty Images)

WASHINGTON, DC - JANUARY 26:  Members of the Bulletin of Atomic Scientists deliver remarks on the 2017 time for the 'Doomsday Clock' January 26, 2017 in Washington, DC. For the first time in the 70-year history of the Doomsday Clock, the Bulletin of Atomic Scientists moved the clock forward 30 seconds to two and a half minutes before midnight, citing 'ill-considered' statements by U.S. President Donald Trump on nuclear weapons and climate change, developments in Russia, North Korea, India and Pakistan. From left to right are Executive Director and Publisher of the Bulletin of the Atomic Scientists Rachel Bronson, theoretical physicist Lawrence Krauss, former U.S. Ambassador to the United Nations Thomas Pickering and retired U.S. Navy Rear Admiral David Titley.  (Photo by Win McNamee/Getty Images)