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March 1985 Science Digest cover story by Andrew Revkin on the science behind "Nuclear Winter" -- the hypothesis that smoke from incinerated cities after a nuclear war could blot the sun and cause calamitous widespread cooling and, possibly, famine. Much has been learned since. Many scientists still see a significant risk. Particularly notable is the body of work by Alan Robock at Rutgers University: http://climate.envsci.rutgers.edu/robock/robock_nwpapers.html
More at Dot Earth:
http://dotearth.blogs.nytimes.com/?s=%22nuclear+winter%22
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