The map is not the territory, you should contrast ideas with realities to see how that is playing out in smaller scales, to have a hint on how it could end in t

The map is not the territory, you should contrast ideas with realities to see how that is playing out in smaller scales, to have a hint on how it could end in the biggest one. One of the most urgent planetary problems right now is climate change, and the closest we have to world government are US and EU, the first denying and boicotting global measures against it since the 90s, the second taking back their pledges as they is some struggle in their gas and oil inputs. Unless you have a god, aliens or a perfect AI (the usual saviors/unifiers in fiction, and we might be as far from the third than from the first one) as government, humans will still go for their own good, in their own scale, with big players pursuing their own benefit influencing whatever is in the global government.