California expects fast Obama move on car pollution

California's top climate change official on Wednesday predicted President Barack Obama's administration would let the state impose its own tough limits on greenhouse gas emissions from cars by May, in what would be a victory for environmentalists. If the EPA reverses the Bush administration ruling, more than 12 U.S. states could proceed with plans to impose stricter limits on greenhouse gas emissions from cars. California wants to reduce the emissions by 30 percent by 2016 -- the most ambitious federal or state effort to address global warming. Environmentalists have said granting California a waiver that allows it to set its own emissions regulations would signal Obama's commitment to tackling climate change. California wants to require carmakers to use paints that reflect more heat, tires that roll smoother and improved air conditioning to boost efficiency beyond the fuel mileage requirements already facing automakers....