A tanker truck passing the Chevron oil refinery in Richmond, Calif. on Wednesday, Nov. 14, 2012. Oil refineries and other polluters in California can buy and sell pollution credits through the state’s cap-and-trade system.
A tanker truck passing the Chevron oil refinery in Richmond, Calif. on Wednesday, Nov. 14, 2012. Oil refineries and other polluters in California can buy and sell pollution credits through the state’s cap-and-trade system. Paul Sakuma AP
A tanker truck passing the Chevron oil refinery in Richmond, Calif. on Wednesday, Nov. 14, 2012. Oil refineries and other polluters in California can buy and sell pollution credits through the state’s cap-and-trade system. Paul Sakuma AP

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