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For carbon-free transportation, California must cover a lot more ground soon. But by some estimates, electric truck fleets could still be a decade away.

Automakers backed Obama-era rules on car emissions and gas mileage, then asked President Trump to change them. Now the companies fear a long Washington-California court fight.

After efforts to unite the West under a carbon-trading program stalled for nearly a decade, Oregon will decide this month whether it wants to follow in California’s footsteps. This bill…

California transportation officials warn the fight over passenger vehicle standards might affect air quality, construction jobs, the economy — and ensure Californians stay stuck in traffic.

Unless the emissions trend is reversed, the state could stall on its route to clean air.

The state may not be able to cut enough greenhouse gases by 2030, says Mary Nichols, who chairs California's Air Resources Board.

Planet-warming emissions could soar 30 percent too high in a little more than a decade, state analysts say.

Mother Nature doesn't follow California's emissions rules.

Last year’s drop in California emissions came not through drastic pollution reductions from oil refineries nor the state’s lauded cap-and-trade program. It was the rain.

On a nearly two-week swing through Europe, starting at the Vatican and ending at the United Nations climate change conference in Bonn, California's governor offered a bleak appraisal of the…

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