Climate Central: Big rigs and other medium- and heavy-duty trucks plying U.S. highways may become much more fuel efficient if new rules proposed on Friday by the U.S. Environmental Protection Agency are finalized.
The rules, submitted as part of the Obama administration's Climate Action Plan, seek to increase the fuel efficiency of big rigs, cut U.S. carbon dioxide emissions by 1 billion metric tons and reduce crude oil consumption by 1.8 billion barrels as a way to reduce the transportation sector's impact on...