The new regulations would also challenge California’s authority to set its own emissions marks, which it seeks to keep at the tougher, Obama-era standards. The Trump administration has drafted a new set of regulations on planet-warming emissions from cars and light trucks that would dramatically weaken Obama-era standards. The proposal, if implemented, would also set up a legal clash between the federal government and California by challenging the state’s authority to set its own, stricter, air pollution rules. Details of the proposal, which is being jointly drafted by the Environmental Protection Agency and the Transportation Department and is expected to be sent to the White House for approval in coming days, were described to The New York Times by a federal official who had seen them but was not authorized to discuss the matter. The proposal follows an announcement this month by the E.P.A. administrator, Scott Pruitt, that the […]