TEXT: California Climate Change Q and A-1 The stacks from the Valero Benicia Refinery are seen as a pedestrian walks in a nearby neighborhood, Wednesday, July 12, 2017, in Benicia, Calif. California Gov. Jerry Brown is racing to convince state lawmakers to extend California's cap-and-trade program which puts a price on carbon emitted by polluters, including oil refineries. The program has been closely watched around the world as a market-based way to reduce greenhouse gas emissions, but it expires in 2020. (AP Photo/Rich Pedroncelli)