JON LOMBERG / SCIENCE PHOTO LIBRARY JON LOMBERG / SCIENCE PHOTO LIBRARY
Nuclear winter. Artwork of the northern hemisphere of Earth after a nuclear war, showing the area (red) of prompt fallout. Fallout consisting of dust and radioactive debris thrown up by the explosions has blacked out the northern hemisphere. The North Pole (at centre) remains uncovered by fallout. Dust and smoke from explosions and fires would block some of the Sun's heat and light, leading to a "nuclear winter". This could cause lowering of global temperatures by as much as 10 degrees Celsius, which would kill countless animals and plants, as well as humans and their sources of food.
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