World peace is an unusually simple problem: it's entirely a marketing problem. We don't even have to get people to buy anything, all we have to do is get them to want it. The marketing is the whole problem. Once everyone wants it, then the problem is solved because no one will fight anymore. It really is that easy.
In talking to people, I have observed three broad 'market segments' that need to be addressed, three types of people. Maybe there are more, but this is what I have found so far:
1) Those who think that humans are violent by nature, and thus war is inevitable. These are believers in the 'killer ape' theory or perhaps they've just seen too much violence in their lives. Fortunately men are not violent by nature, the 'killer ape' theory is discredited, and in any case we are capable of choosing our destinies.
2) The second group are those who would stop fighting, but the 'other guys' won't stop. These are most Americans. They didn't want to attack Afghanistan originally, but the Afghanis struck first, so what choice was there? These people happily would support peace if they saw it as a viable possibility. Fortunately, peace is viable because it is the most profitable solution, we just need to help the world see that. The more people start supporting peace, the more this group will become convinced that peace is possible.
3) The third group is the most difficult group, because they actually have something to gain from war. In this category was Slobodan Milosevic, who wanted to consolidate power in his country, or warriors on the edge of the Sahara who want to take others' land for their own cattle. Some people fight because it is exciting, they like the thrill. These people need to see that there is a better way, and that their children will want to live in peace, and sometimes compromise is worth it. Anyone who has loved has learned the value of compromise. These people can too.
Try to talk to everyone you can about world peace, because word of mouth is the best type of marketing.