EcoWatch: Trucks on U.S. roads and highways have long needed an efficiency makeover, and President Barack Obama demanded it Tuesday afternoon in Maryland.
Obama said his administration will issue tougher fuel-efficiency standards for delivery trucks by March 2016, The Associated Press reported. Heavy-duty trucks are only 4 percent of the vehicles on the country`s roads, but account for about 20 percent of the greenhouse gases that the transportation sector emits into the air.
"For decades the fuel efficiency...