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<p>Chevron oil refinery in Richmond, Calif. On Wednesday, 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.</p>

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Targeting greenhouse gases
November 15, 2012 8:15 p.m.

Targeting greenhouse gases

SAN FRANCISCO - California began auctioning permits Wednesday for greenhouse gas emissions, launching one of the world's most ambitious efforts to cut heat-trapping gases from industrial sources.