One of the most persistent and startling news stories of the past year has been the global crisis in the world's food supply. Reduced stockpiles have led to panic buying and hoarding, a sharp rise in prices, food riots, the virtual collapse of portions of the food industry, and dire warnings...

The politics of food is changing fast. In rich countries, obesity is now a more serious problem than hunger. Consumers once satisfied with cheap and convenient food now want food that is also safe, nutritious, fresh, and grown by local farmers using fewer chemicals. Heavily subsidized and...