This 2010 file photo shows a tanker truck passing the Chevron oil refinery in Richmond, Calif. The refinery is one of many California sources of carbon dioxide emissions covered by the state’s cap-and-trade system of pollution control.
This 2010 file photo shows a tanker truck passing the Chevron oil refinery in Richmond, Calif. The refinery is one of many California sources of carbon dioxide emissions covered by the state’s cap-and-trade system of pollution control. Paul Sakuma AP
This 2010 file photo shows a tanker truck passing the Chevron oil refinery in Richmond, Calif. The refinery is one of many California sources of carbon dioxide emissions covered by the state’s cap-and-trade system of pollution control. Paul Sakuma AP