The optimist and the realist in me live in different time periods on this one. In the present, there seems to be no viable path to global peace. Human evolution just isn't at that stage and I can only see it happening with a few more millennia of progress. If we can possibly survive to that point.
There is the rub. Survival to the point that peace could be global. We are on several collision courses in the path to global peace, and the most alarming is the one capable of triggering all the other disasters we fear most, the one that can truly bring the Four Horsemen of the Apocolypse - Conquest (or Pestilence), War, Famine and Death - into our presence. That single source is not JUST iniquity, although the true believers of the literal will no doubt fault me on this, it is the inevitable collision with reality that an unsupportable population brings.
At our current acceleration of population, we are heading for a collapse of the bridge to the human future, for we will be unable to supply the resources necessary to sustain ourselves. This, under present reckoning, is an unavoidable fact. The result is the entrance of the Four Horsemen and the less literal interpretation is that these are the necessary forces that will come into play as the conflict of over populating hits the full tipping point.
We are already well on our way and can see the results all around us. We have global warming. We are polluting. People are starving. We have wars. Ultimately, many people will die on a mass scale.
But ... this is where the optimist in me walks in, my internal version of the True Believer. Given mankind's drive to survive, it will become apparent even to the ignorant that extinction is a very real possibility. Existence itself will become intolerable on a more massive scale and humankind will either need to mount a massive defense of its viability ... or die. When confronted with these options, it is amazing what people can do.
Is global peace possible? Yes, I think so. But it looks like a great deal of trauma may be necessary to truly awaken us to a better potential. Do you agree?