[@Lord Coake]
I'm sort of interested, but...
I dunno, it seems sort of overused/stale

I mean, there's the one faction, UESA, whose name doesn't really... fit humanity, so to speak, without any sort of external threat to be the cause for such unity. No, I don't think there'd be a 'united earth' unless there was an imminent threat, and even then, I doubt the nations would get along.

Every nation on the planet would be hesitant to cede control of any of their assets to anyone else. More likely, groups of nations would band together in alliances, still individually, but would help each other out in times of need.