Nuclear Winter
In discussing the state of the atmosphere following a nuclear exchange, we point especially to the effects of the many fires that would be ignited by the thousands of nuclear explosions in cities, forests, agricultural fields, and oil and gas fields. As a result of these fires, the loading of the atmosphere with strongly light absorbing particles in the submicron size range (1 micron = 10-6 m) would increase so much that at noon solar radiation at the ground would be reduced by at least a factor of two and possibly a factor of greater than one hundred.
Notes:
An explanation of the science behind this concept and the back-of-the-napkin calculation.
Folksonomies: environmentalism
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The Atmosphere after a Nuclear War: Twilight at Noon