Interesting: Nuclear War Would Not Cause Global Warming

NASA Space News has interesting article in which a NASA scientist put to the test as to what would happen if the earth had a nuclear war.
From the article: Oman: We studied the scenario of using 100 Hiroshima-size bombs, the fires from which would inject upward of 5 teragrams (megatons) of black carbon particles into Earth's upper troposphere. Observations of forest fires have shown this to occur on much smaller scales.On the ground, global temperatures would fall by a little over 1 degree Celsius (C) (1.8 Fahrenheit (F)) over first three years. In contrast, aerosols from the 1991 eruption of Mount Pinatubo contributed to about 3/10 of a degree C (~ 0.5 F) of cooling over one year. Black carbon particles are smaller than sulfate particles and can be lofted much higher by solar heating, where their influence on climate can last up to a decade.We also saw that two to four years after the event, rainfall would decrease globally by an average of about 10 percent. http://spacestation-shuttle.blogspot.com/2011/02/how-would-nuclear-war-affect-climate.html
I don't know, but I always thought that a nuclear war would have more of an effect on the climate.
Of course that nasty problem of radiation would be pretty bad.