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In this April 30, 2008 file photo, American flags are seen near the Shell refinery, in Martinez, Calif. On Weds., Nov. 14, 2012, California’s largest greenhouse gas emitters will for the first time begin buying permits in a landmark “cap-and-trade” system meant to control emissions of heat-trapping gases and spur investment in clean technologies. The program is a key part of California’s 2006 climate-change law, AB32, a suite of regulations that dictate standards for cleaner-burning fuels, more efficient automobiles and increased use of renewable energy. (AP Photo/Ben Margot, File)

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