Whose green is greener? The US auto industry's environmental showdown

Lawyers representing the US’s largest automakers – including Ford, General Motors and Toyota – are challenging the 2002 state law that says manufacturers must produce cars and light trucks that pump out 30 per cent less greenhouse gases by 2016.

California can set its own vehicle pollution standards because it started regulating emissions before America’s Environmental Protection Agency was even created, says Garance Burke in BusinessWeek.

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