I seriously wouldn't worry about the nuclear wars. Anybody mad enough to nuke anything at all is way too mad to be able to operate a nuke. Sure, there are some mad people with their hands on buttons at the moment, but not that mad.
If you really want a good doomsday scenario, I'd recommend Yosemite any day of the week. Infinitely more likely than any of the above.
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Strewth
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