Tue Oct 16, 2012 02:35 PM CDT

SAN FRANCISCO (AP) -- In a case seeking to stop California's first-in-the-nation mandate requiring fuel producers to reduce greenhouse gas emissions, federal justices on Tuesday focused their questions on whether the law discriminates against out-of-state businesses.

A three-justice panel of the 9th U.S. Circuit Court of Appeals heard oral arguments about the constitutionality of California's "Low Carbon Fuel Standard," a piece of the state's landmark global warming law, AB 32.

The California Air Resources Board, the agency in charge of implementing the law, said the standard will cut California's dependence on petroleum by 20 percent, and will account for one-tenth ...

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