Do you know of any workable utopian social theories, that are in any novels?

More specifically, where the people of Earth (us) make the breakthrough from the chaotic, peace deprived world that we currently inhabit, into a world of comprehensive, global peace. Surely someone has come up with a specific and adequate blueprint by now.
If you do know of any, can you please give a brief outline of the theory, or provide a link to some info about it?
It need not be restricted to the people of Earth if that’s any help.