Like what you see in the supermarket produce section? Enjoy, because things may be changing there -- the prices, even the mix of available fruits, nuts and veggies. Long acknowledged as "the nation's salad bowl," California's farm belt is facing some thorny challenges from our changing climate: rising temperatures, an uncertain water supply and more abundant pests that threaten multi-billion-dollar crops. The half-hour documentary Heat and Harvest, a co-production of KQED and the Center for Investigative Reporting, examines these threats and some potential solutions.