California Air Resources Board Member Ron Roberts talks with ARB chair Mary Nichols during a hearing held Thursday, Sept. 20, 2012, in Sacramento, Calif. The board took testimony from experts and the public on the the cost to businesses and consumers with the implementation of AB32, California's landmark greenhouse gas emissions law. (AP Photo/Rich Pedroncelli)

Associated Press
California Air Resources Board Member Ron Roberts talks with ARB chair Mary Nichols during a hearing held Thursday, Sept. 20, 2012,  in Sacramento, Calif.  The board took testimony from experts and the public on the the cost to businesses and consumers  with the implementation of AB32, California's landmark greenhouse gas emissions law. (AP Photo/Rich Pedroncelli)
California Air Resources Board Member Ron Roberts talks with ARB chair Mary Nichols during a hearing held Thursday, Sept. 20, 2012, in Sacramento, Calif. The board took testimony from experts and the public on the the cost to businesses and consumers with the implementation of AB32, California's landmark greenhouse gas emissions law. (AP Photo/Rich Pedroncelli)
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