When famine, drought, and malnutrition plagued their communities, these farmers tried something revolutionary--and managed to nourish their families and their land in the process. Farmers in some of the world's oldest agricultural areas--Africa's Great Rift Valley, India's Indo-Gangetic Plain, the Highlands of Central America, and the Great Plains of the U.S.--were toiling year after year, only to find that modern industrial agriculture...