If your argument for veganism is based on the higher efficiency of production of vegan foods, have you considered that the computer you're using is ALSO an unnecessary item that could purchase a hell of a lot of food for third world countries? The US government actually pays a large portion of farmers not to farm, because we'd otherwise have /too much/ food. You believe that? We eat meat for the same reason we use computers. Don't tell me you think we should go back to an agrarian lifestyle.