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The California Air Resources Board announced Dec. 3 it was suspending enforcement for at least two years of its greenhouse gas (GHG) trailer standards, which had been set to go into effect Jan. 1.

President Donald Trump’s administration asked a federal judge to throw out California’s lawsuit seeking to preserve its power to regulate tailpipe greenhouse gas emissions, saying Washington has the last word in setting fuel economy standards.

The complexity of building a bullet train through Southern California’s urban maze is leading state officials to consider two major additions: a tunnel under the Burbank airport and a project that would help a freight railroad expand its switching yards in the Inland Empire.

California intensified its battle against fossil fuels by seeking independent reviews of all pending hydraulic fracturing permits and halting approvals of a key production technique in an area that has pumped crude for more than a century.

California sued the Trump administration for rescinding an Obama-era waiver that allows the state to require sales of electric vehicles and set stricter auto-emissions standards than the federal government.

Transit officials in San Diego are rolling out a new $12.5 million pilot program to test the region’s first electric buses.

Even a brief blackout can be costly. Now California faces the experiment of finding what out happens economically when a modern metropolitan area goes without power — on purpose — for what could be days.

Automakers that are under U.S. antitrust scrutiny over an emissions agreement reached with California regulators are set to meet the week of Sept. 30 with the Justice Department, according to a person familiar with the matter.

Democratic Gov. Gavin Newsom has signed into law a bill that directs the California Air Resources Board and other state agencies to develop and implement a new smog inspection program for heavy-duty diesel on-road trucks.

California drivers soon may pay $4 a gallon at the pump after refinery upsets pushed up the wholesale market in San Francisco to the strongest level in almost seven years.