I believe it is the probability that a nuclear war occurs AND leads to human extinction, as described in The Precipice. I think I would agree that if it was the just the probability of nuclear war, this would be too low, and a large reason the number is small is because of the difficulty for a nuclear war to cause human extinction.
I believe it is the probability that a nuclear war occurs AND leads to human extinction, as described in The Precipice. I think I would agree that if it was the just the probability of nuclear war, this would be too low, and a large reason the number is small is because of the difficulty for a nuclear war to cause human extinction.