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Zombie Apocalypse.
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Nuclear Armageddon.
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Alien Invasion.
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Leftist Totalitarian World Government.
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That's the thing. Nuclear winter is BS. It cannot happen. We detonated over 2000 nukes in the atmosphere, and temperature was unaffected. detonating 10 times as much will still have no effect. Large eruptions like Pinatubo can barely lower the temperature 2 degrees. Nuclear winter is not a thing.
A nuclear winter is caused by ash produced by breaking things, such as the destruction of several cities. The nukes themselves do not directly cause the phenomenon.
You don't understand.
There have been a combined total of 540,000 kt of nuclear explosions across 2500 tests. Sedan was a shallow buried 110 kt explosion that excavated 11,000,000 tons of material. There are currently around 3000 deployed nuclear weapons. Assuming that ALL detonations in an nuclear exchange were buried to maximize material excavated, (an insane assumption) they would excavate around 5x10^10 tons of material. That is on the same order of magnitude of the 1991 eruption of Mount Pinatubo, which ejected 1.1x10^10 tons of material.
Even if we assumed that 5 times the material gives a 5 times the reduction in temperature (it doesn't, see the Mount Tambora eruption of 1815), that is still only 2 degrees.
Nuclear winter is pure fear mongering. It does not exist.
I think you are severely underestimating the amount of ash and debris that would be put into the air from several dozen cities
I'm severely overestimating it. Most of the nukes would be airburst, and their fireballs would never make contact with the ground. The shockwaves are what cause the damage, not the radiation.
https://en.wikipedia.org/wiki/Sedan_(nuclear_test)