Nuclear winter is a predicted effect of It has been theorized that severely cold weather and reduced sunlight for a period of months or years could be caused by detonating large numbers of, especially over targets such as, where large amounts of and would be ejected into the
Similar climatic effects can be caused by a or also sometimes termed an, or of a eruption, known as a
The nuclear winter predicts that the huge fires caused by (particularly from burning urban areas) would loft massive amounts of dark smoke and particles from the fires into the upper /. At 10-15 kilometers (6–9 miles) above the Earth's surface, the absorption of sunlight would further heat the smoke, lifting it into the stratosphere where the smoke would persist for years, with no rain to wash it out. This would block out much of the from reaching the surface, causing surface temperatures to drop drastically.
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