This year, L.A. school lunches will be a little more "green." Not the food, but the trays. That's because trays made from polystyrene have been banned. These styrofoam serving dishes are not biodegradable and critics say they fill up landfills. Now, the Los Angeles Unified School District is opting for what they hope is a more eco-friendly option. KPCC's Vanessa Romo reports on the change.