“In a nuclear war, immense nuclear firestorms in burning cities would create millions of tons of thick, black, radioactive smoke. This smoke would rise above cloud level and quickly surround and engulf the entire Earth. The smoke would form a stratospheric smoke layer that would block sunlight from reaching the surface of Earth for a period of about ten years.  Heated smoke in the stratosphere would cause massive destruction of the protective ozone layer. Huge amounts of harmful Ultraviolet light would penetrate the smoke and reach the surface of…