Pick a place, pick a weapon (China’s ultra-modern 140-kiloton DF-31 will do), and press the NUKE IT! button. You’ll be surprised to see how small Fat Man and Little Boy were in comparison with the Soviets’ 50-megaton Tsar Bomba: If you detonated it in Amsterdam, the blast radius would reach Utrecht. But all the bombs in the world are firecrackers when you compare their impact with that of an asteroid (something Ground Zero also allows you to do). How bad would that be? Just ask the dinosaurs.
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