The easiest way to solve world hunger would be to butcher 2/3 of the world's cattle right off. It takes 12 lbs of grain to produce 1 lb of beef, and with grain producing twice the workable energy and nutrition of the beef, you'd first cut the united state's bad emissions by 40%...yes 40%. Effectively freeing up 2/3 of the grain to be chopped into breads or something human nourishment. Also giving all that beef as a protein and fat supplement for all those people. With the extra grain and room from removing all the cattle, we could farm more grains to feed more people more effectively. This would, of course, increase the costs of beef exponentially for the average joe. While I do love me some beef, I could do without if I knew it kept the world in a better place.