(Looking at the list of nuclear close calls it seems hard to believe the overall chance of nuclear war was <50% for the last 70 years. Individual incidents like the cuban missile crisis seem to contribute at least 20%.)
There’s reason to think that this isn’t the best way to interpret the history of nuclear near-misses (assuming that it’s correct to say that we’re currently in a nuclear near-miss situation, and following Nuno I think the current situation is much more like e.g. the Soviet invasion of Afghanistan than the Cuban missile crisis). I made this point in an old post of mine following something Anders Sandberg said, but I think the reasoning is valid:
Robert Wiblin: So just to be clear, you’re saying there’s a lot of near misses, but that hasn’t updated you very much in favor of thinking that the risk is very high. That’s the reverse of what we expected.
Anders Sandberg: Yeah.
Robert Wiblin: Explain the reasoning there.
Anders Sandberg: So imagine a world that has a lot of nuclear warheads. So if there is a nuclear war, it’s guaranteed to wipe out humanity, and then you compare that to a world where is a few warheads. So if there’s a nuclear war, the risk is relatively small. Now in the first dangerous world, you would have a very strong deflection. Even getting close to the state of nuclear war would be strongly disfavored because most histories close to nuclear war end up with no observers left at all.
In the second one, you get the much weaker effect, and now over time you can plot when the near misses happen and the number of nuclear warheads, and you actually see that they don’t behave as strongly as you would think. If there was a very strong anthropic effect you would expect very few near misses during the height of the Cold War, and in fact you see roughly the opposite. So this is weirdly reassuring. In some sense the Petrov incident implies that we are slightly safer about nuclear war.
Essentially, since we did often get ‘close’ to a nuclear war without one breaking out, we can’t have actually been that close to nuclear annihilation, or all those near-misses would be too unlikely (both on ordinary probabilistic grounds since a nuclear war hasn’t happened, and potentially also on anthropic grounds since we still exist as observers).
Basically, this implies our appropriate base rate given that we’re in something the future would call a nuclear near-miss shouldn’t be really high.
However, I’m not sure what this reasoning has to say about the probability of a nuclear bomb being exploded in anger at all. It seems like that’s outside the reference class of events Sandberg is talking about in that quote. FWIW Metaculus has that at 10% probability.
There’s reason to think that this isn’t the best way to interpret the history of nuclear near-misses (assuming that it’s correct to say that we’re currently in a nuclear near-miss situation, and following Nuno I think the current situation is much more like e.g. the Soviet invasion of Afghanistan than the Cuban missile crisis). I made this point in an old post of mine following something Anders Sandberg said, but I think the reasoning is valid:
Essentially, since we did often get ‘close’ to a nuclear war without one breaking out, we can’t have actually been that close to nuclear annihilation, or all those near-misses would be too unlikely (both on ordinary probabilistic grounds since a nuclear war hasn’t happened, and potentially also on anthropic grounds since we still exist as observers).
Basically, this implies our appropriate base rate given that we’re in something the future would call a nuclear near-miss shouldn’t be really high.
However, I’m not sure what this reasoning has to say about the probability of a nuclear bomb being exploded in anger at all. It seems like that’s outside the reference class of events Sandberg is talking about in that quote. FWIW Metaculus has that at 10% probability.