Greenwire: California air regulators approved the world’s first plan yesterday for reducing carbon emissions from transportation fuels after making concessions aimed at placating the biofuels industry and expressing concerns about the rule’s impact on the state’s battered economy. The Air Resources Board’s 9-1 decision is aimed at achieving a 10 percent reduction in motor vehicles’ emissions of greenhouse gases by 2020 and spurring commercial development of low-carbon fuels like hydrogen and …