A utopian world where everyone pitches in is far fetched. So? So's believing that everyone will be judged after death... or that a terrorist is really a holy warrior, in their religion... or that Africans raping babies and killing them so that AIDS wont hurt them.
So is every religion/basis of belief. If no one ever dreamed, the world would never change. I'm not saying anyone's right, or wrong even. I just believe that it's possible. And if you didnt believe that it was possible, of world peace, or unification, or a utopian world of flowers and daisies... then why do you call yourself a christian? Isnt that almost exactly whats going to happen, according to the bible? Yes, in revelations it also does say that the Antichrist will bring about 3 years of world peace. Go world peace!
Anyway. The UN would have more than enough support if people, as in nations, would actually do that. Support, that is. The only reason the UN 'falls back' upon the United States is because we always do what we want to, in the end. Hell, even when the Iraq thing happened, we ended up flipping the bird to the UN and we attacked that nation. Besides, if most of the financial burden was American, then most of the people in space and land distributed on Mars and such would be American, too!
Germany and Russia agreed not to attack each other, either. Besides, in War, who's smart enough about anything? Lines will be drawn in the sand, as they have been before with wars, especially modern wars, and the sand will fly. The US will probably be the primary target in a war, or Russia, simply because of our ability to retaliate if one of our allies were nuked. Not just our ability to retalitate, but our willingness to. We would nuke someone who nuked an ally. Simply because war is stupid, and unjustifyable. Especially what choices are made during war. Genearlly speaking, those nations of the middle-east are primarialy Islamic. There are more than a billion of them. And not all of them are happy with us. Also, with what we've done in Iraq, and all of the demonstrations that happened across the globe over it... how can you limit our enemies to those we're aware of?
The most dangerous enemies are those you dont know about.
Not speculation about nuclear weaponry, so to speak. Just general Nuclear Warfare Tactics.