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The term " nuclear winter " was a neologism coined in 1983 by Richard P. Turco in reference to a 1-dimensional computer model created to examine the " nuclear twilight " idea , this 1-D model output the finding that massive quantities of soot and smoke would remain aloft in the air for on the order of years , causing a severe planet-wide drop in temperature .
 Richard P. Turco
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Answer:
 Richard P. Turco