The thing that strikes me is that we've never had more than a two small nukes fired off in anger although lots more have been fired as tests. Even so, have we actually had more than a handful fired at the same time, or within a short space of time?
Therefore we just don't really know what exactly may happen. Yes, there's been computer models, etc done, but they're all still based on a load of assumptions and single shot test results.
So, to me, anything is possible. We may have the deepest, darkest nuclear winter imaginable, or little more than an environmental hiccup (likely somewhere in the middle though in my opinion). If the worst drought in history is what the writers applied to North America in their version of nuclear aftermath, then I can't see any reason not to run with it. If an individual GM wants to black out the sun for five+ solid years ala "The Road", then that's worth running with also.
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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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