This is my answer to this Question on Quora.
For me personally World Peace is a practical achievable state of World Affairs.
My solution for World Peace is simple and available;
To achieve World Peace we either reform the United Nations or replace it with the following Mandate.
‘To achieve World Peace a renewable World Mandate is required for a Legal Unified Overwhelming World Force, under a single command and without taking sides, to bring to an immediate end by all means available any conflict which immediately threatens the people and stability of the Country and Region involved’.
However, we live in a World where Governments do what is best to keep them in Political Power and not what is best for the World.
Therefore, until such times as such a Mandate exists without the veto then World peace is a fantasy.