Fires have to generate a massive updraft to punch into the stratosphere, and this is well-known in major volcanic eruptions like Pinatubo, but it looks like rec

Fires have to generate a massive updraft to punch into the stratosphere, and this is well-known in major volcanic eruptions like Pinatubo, but it looks like recent evidence shows this is entirely plausible: > "Recent catastrophic forest fires in Canada in 2017 and Australia in 2019 and 2020 produced 0.3–1 Tg of smoke (0.006–0.02 Tg soot), which was subsequently heated by sunlight and lofted high in the stratosphere. The smoke was transported around the world and lasted for many months. This adds confidence to our simulations that predict the same process would occur after nuclear war." Also, if the world's major nuclear reactors, spent fuel rods pods, and dry cask waste storage were targeted with nuclear weapons, there'd be massive radioactive fallout on top of everything else.