Corn is one of the main exports of Illinois, used for both food and biofuel--in fact, about 40 percent of the corn grown in the U.S. is used for biofuel production. But a new study from the University of Illinois found that, for the first time, using corn for biofuel comes with more costs than benefits. Morning Shift talks to the researchers behind the study: Praveen Kumar, University of Illinois professor of civil and environmental engineering, and graduate student Meredith Richardson.