wow, this exploded a lot since I last checked up, so lets see whats going on here.
The main zombie type I was aiming for was the slow, "WWZ" zombies; slow, and no semblance of brain activity, but can only be killed by destroying the brain, and have literally no limit to their stamina.
The idea of nukes damaging the zombies flying around seems reasonable, until you look at how a nuke works more directly. Whilst the bomb does release a massive amount of power that will undoubted kill anything close enough to ground zero, most the deaths from these weapons are caused by concussions and radiation.... none of which have any affect on zombies.
There was one idea about starting from the ancient age, which was something I was considering, but I decided to stick to a more modern setting (1960-2010) for this (theoretical) idea, as it wouldn't be fair to be behind in the techs for this scenario (also, there might be a tech tree more focused on surivalism, and fighting the undead)
I liked the ideas you guys put up about having to create new cities in colder areas, and then maybe regathering your resources to push back into the infected cities to reclaim your land.