California Climate Change Q and A

A truck drives into the Valero Benicia Refinery, Wednesday, July 12, 2017, in Benicia, Calif. California Gov. Jerry Brown is racing to convince lawmakers to extend the state'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)