The only way to bring world peace is to unite the world under one government. The best form of government for this would be a semi-democratic unitary system of government. Then, the world would have to go through a mass disarmament of military hardware, then the control of the hardware would be transferred to the world government. The countries of the world would be able to run like they always do, but they would be disarmed to prevent wars, the world government would control international trade (to a certain extent). This may seem a lot like communism, but the difference is that the economy is a hybrid of a free market and command economy, so people can live like they normally do, but the countries must provide aid to each other when needed, or, as the bible says (I am an atheist, but this part makes sense): Love thy neighbor. The solution to international problems would be a simple lock the leaders into a room until they agree to get along. This is how the world could experience peace.
I know I have some views that may be considered controversial, but do not label me as a communist, nazi, ect. I simply look at things logically. If you do not think this is the way, I defy you to come up with a more viable solution.