Can sustainable farming save Iowa's precious soil and water?

Iowa is a powerhouse producer of corn and soybeans. But all the industrial farming has come at a cost to the environment. Today, there's a growing number of farmers adopting more sustainable practices in a bid to save Iowa's precious soil and water. NewsHour Weekend Special Correspondent Mark Bittman reports as part of our "Future of Food" series, supported in partnership with the Pulitzer Center.