CHULA VISTA, Calif. — It’s lunchtime here in Chula Vista, what’s on the menu? Mixed veggies, corn dogs, tamales and of course everyone’s favorite chicken sandwiches. But not everything that lands on a student’s tray will be eaten. Perfectly good, edible food tossed in the garbage, those uneaten chicken sandwiches would eventually find their way into a landfill, decompose and create methane a harmful gas that contributes to climate change.