Working to speed up the switch: Companies, activists push zero-emission truck sales

FILE —11 In this Dec. 17, 2010 file photo, trucks make their way eastbound, in Livermore, Calif. More than 75 national companies are throwing their weight behind a drive to make trucks, vans and other large commercial fleet vehicles cleaner as a climate change initiative. Several states, including Massachusetts, New Jersey, New York, Oregon and Washington, already are backing the move. (AP Photo/Ben Margot, File)

BOSTON — Officials from companies with fleets of trucks are urging governors across the country to embrace a rule meant to speed the adoption of zero-emission trucks and reduce a potent source of greenhouse gases spewed from the large commercial vehicles.