My understanding is that there are many schools of thought on this - nobody really knows.
The lastest thinking (I think) is that a full scale nuclear winter to the point of blacking out the sky and snow all year round is EXTREMELY unlikely. The number of nukes required to cause this to occur would essentially leave the planet a lifeless hunk of charred rock floating about in space - do we really care about the winter if we're nothing but glowing ashes?
Yes, there are likely to be some negative effects (like there'd be positive?) but on a much more limited scale.
Would global warming negate nuclear winter? Well, that's probably a bit like torching the house just to keep warm for the night.... Effective in the short term, but catastrophic the next morning.
Seriously though I doubt nuclear winter would balance global warming - it might even make the situation worst....
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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