Dr. Alan Robock: Dear President-Elect Biden, please start with the easiest problem to solve

Dr. Alan Robock was one of the scientists who helped to discover in the 1980s that a nuclear war between the U.S. and the Soviet Union smoke from fires ignited by nuclear explosions would block out the Sun, turning the Earth cold, dark and dry, killing plants and preventing agriculture for at least a year, producing global famine. The Doomsday Clock is now 100 seconds to midnight, the closest it has ever been.

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