I think we should start a world government from scratch. A global, grassroots, democratic fellowship of people, operated locally and cooperating globally. All persons are considered members, and they can assert their membership by joining a local group or starting their own. We recognize the other power structures in the world; the governments and the corporations and the religions. We may even belong to some of them, this fellowship is not exclusive.

Unfortunately I haven't figured out how to define membership, or verify the integrity of votes or member identity, or implement a functional judiciary, so this is more of a long-term project. But I think long-term, humans need to figure out how to settle our differences without killing each other, and I don't trust the existing power structures to willingly give up their authority. It has to be bottom up, and every one has to have a voice.