How destructive are nuclear weapons really? This is a question that seems to be asked far less often than it should be, and is rarely discussed in a non-alarmist way. In fact, nuclear weapons are not a threat to humankind, and we can expect a vast majority of people to live through a nuclear war. None of this is to say that nuclear war wouldn't be a big deal, or a terrible humanitarian catastrophe, but it wouldn't be enough to wipe out civilization, much less the human race or all life on Earth.

We should probably start with a look at the state of the global stockpile, because it's fallen dramatically in the last 30 years. After peaking at around 70,000 warheads in the mid-80s, it's fallen to only 12,700 according to the Federation of American Scientists. The majority of these are in the reserve stockpiles of the United States and Russia, which are there in case the current arms-control regime fails, and would take time to deploy. Denying the other side this time is undoubtedly a major objective of both nation's nuclear forces, so in practice, we should instead look at deployed warheads. Arms-control treaties limit both nations to 1,550 deployed warheads, although FAS estimates 1,588 for Russia and 1,644 for the US, probably due to slight differences in definitions. Worth adding to this are the Chinese (380 warheads), the French (280) and British (120), for a global total that we can round to 4,000 warheads for simplicity. Some of these won't work, or will get shot down, but we can assume that other nations and the surviving stockpile weapons will bring the total back up. Note that this is a worst-case all-out nuclear war, and there are potential off-ramps short of it even if there was, say, a tactical nuclear exchange in Eastern Europe, although they aren't certain.
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