Gypsy moth caterpillar populations were high in central Pennsylvania last summer and are projected to be higher this year. We'll talk with a spokesperson from Pennsylvania's Department of Conservation and Natural Resources about the situation. We'll also continue our look at alternative energy. Experts say coal is plentiful and cheap, but is there still a place for coal in America's energy future? Guests: Donald A. Eggen, Ph.D. & Dr. Harold Schobert