Widespread famine and disease would likely follow, experts speculate.
In NASA climate models, this carbon then absorbed solar heat and, like a hot-air balloon, quickly lofted even higher, where the soot would take much longer to clear from the sky.
Reversing Global Warming?
After ten years, average global temperatures would still be 0.9 degree F (0.5 degree C) lower than before the nuclear war, the models predict.
Years Without Summer
For a time Earth would likely be a colder, hungrier planet.