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The Doomsday Clock is seen at 89 seconds to midnight, the closest the clock has ever been to midnight in its 78-year history. / Credit: SAUL LOEB/AFP via Getty Images ...

The Doomsday Clock, which has been used to examine the world’s vulnerability to global catastrophe for nearly a century, has moved one second closer to midnight. On Jan. 28, the Bulletin of the ...

The Doomsday Clock is seen at 89 seconds to midnight, the closest the clock has ever been to midnight in its 78-year history. SAUL LOEB/AFP via Getty Images ...

NEW YORK, NY - SEPT 24: The “Climate Clock” in Union Square counts down the years, days, hours, minutes, and seconds the Earth has left to take action to stop global warming. (Photo by Alexi ...