Even though nobody wants a nuke but some think it might be necessary... It's impossible... Not only the impact on the environment but the impact on politics would never be the same. It's been a loooooong time since the last nuke and things have changed. The impact of social media on elections, media coverage, surveillance coverage (if a nuke was detonated we would capture it from 100 different perspectives), the way foreign policy works. A nuke just can't happen. Unless a nation is literally CRAZY enough to use a nuke, they can't and won't be used. If it came to a nuke war, America has the most but that doesn't matter... we would destroy everybody including ourselves. We ( and whoever else was launching nukes ) would put the world into a post-apocalyptic like scenario. 80-90% of earth's population would be wiped out when the end finally came.
I hate obama, but I'm glad he is not quick to war. That would be worse. It's too easy to escalate the situation to extreme scenarios.