Washington Post: THE WORLD’S most dangerous conflicts stem from religion and ideology — tragic proof that man does not live by bread alone. But when bread is hard to get, that, too, causes unrest. And lately, it has been very expensive indeed: The World Bank estimates that global food prices have risen 83 percent in the last three years. Hence, food riots in Haiti, Egypt and Ethiopia and the use of troops in Pakistan and Thailand to protect crops and storage centers. Many countries are banning or limiting …