Cattle raised at the U.S. Meat Animal Research Center in Clay Center, Neb. A New York Times investigation of animal suffering at the federal research center has prompted a USDA review. Nati Harnik/AP hide caption

itoggle caption Nati Harnik/AP

A man harvests fruits of the Jatropha tree in Taabo, Ivory Coast. Jatropha, which is grown in many parts of the world, has fallen from favor as a diesel fuel substitute. Kambou Sia/AFP/Getty Images hide caption

itoggle caption Kambou Sia/AFP/Getty Images