I think there's little doubt that tons of soot and ash in the upper atmosphere can cause periods of global cooling. The problem with the nuclear winter hypoth

I think there's little doubt that tons of soot and ash in the upper atmosphere can cause periods of global cooling. The problem with the nuclear winter hypothesis is in the link between nuclear war and tons of soot in the stratosphere. These nuclear winter models make a lot of assumptions about the likelihood of a modern cities turning into firestorms and the amount of soot they would generate, the amount of soot lifted into the stratosphere by the fireball, and the amount of soot that stays there instead of precipitating out.