Tue Oct 16, 2012 07:25 AM CDT

SAN FRANCISCO (AP) -- A federal appeals court will hear arguments in a case seeking to stop California's first-in-the-nation mandate requiring petroleum refiners and ethanol producers to make cleaner fuels for millions of cars and trucks in the state.

At issue before the 9th U.S. Circuit Court of Appeals is the constitutionality of California's "Low Carbon Fuel Standard," an important piece of the state's landmark global warming law, AB 32.

The mandate requires petroleum refiners, fuel distributors and others to make cleaner-burning fuels for the California market.

But out-of-state oil refiners and biofuels producers have sued over the law, saying ...

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