California is suing the US federal government over its failure to back the state's tough new anti-pollution laws regulating greenhouse gas emissions.Two years ago, California passed legislation requiring car-makers to cut vehicle emissions by 30% by 2016.
But for the measure to take effect, the Environmental Protection Agency (EPA) must give its approval.
State governor Arnold Schwarzenegger said there was no legal basis for the EPA to stand in California's way.
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