c.f., Nuclear Winter the Human Effects at The Anthropology of Human Survival -
WASHINGTON Even a small nuclear exchange could ignite mega-firestorms and wreck the planets atmosphere.
New climatological simulations show 100 Hiroshima-sized nuclear bombs relatively small warheads, compared to the arsenals military superpowers stow today detonated by neighboring countries would destroy more than a quarter of the Earths ozone layer in about two years.
Regions closer to the poles would see even more precipitous drops in the protective gas, which absorbs harmful ultraviolet radiation from the sun. New York and Sydney, for example, would see declines rivaling the perpetual hole in the ozone layer above Antarctica. And it may take more than six years for the ozone layer to reach half of its former levels.
Researchers described the results during a panel Feb. 18 at the annual meeting of the American Association for the Advancement of Science, calling it a real bummer that such a localized nuclear war could bring the modern world to its knees.
No, it is not a cure for global climate warming–
We see significantly greater cooling than other studies, perhaps because of ozone loss . Instead of a globally averaged 1.3-degreeCelsius drop, which Robocks atmospheric model produced, its more like 2 degrees. But we both see a 7 percent decrease in global average precipitation in both models. And in our model we see a much greater global average loss of ozone for many years, with even larger losses everywhere outside of the tropics.