If Iran gets a nuke, there will be nuclear war. Either they will attack Israel or Israel will attack them. There’s no way around it. The nuclear winter caused by lobbing missiles back and forth may be what the Mayans were talking about.
And by the way, did you see where they found some new Mayan documents that say it’ll all be Bush’s fault?
Please be careful of that Nuclear Winter meme: it was made up by Sagan and heavily promulgated by the left for the sole intent of criminalising the West's nuclear weapons. It's one of the most instantly accepted yet completely unexamined 'truths' on the planet.
A good (but indifferently formatted) analysis can be found here