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CINCINNATI — Truck and engine makers said that meeting the federal government’s greenhouse-gas standards that take effect in 2017 while still complying with the 2010 emissions rule is a difficult challenge and could result in more “hard programming” of engine settings and fewer choices for fleets in their tractors.

A federal appeals court backed the Obama administration's campaign to limit greenhouse-gas emissions, the Wall Street Journal reported Wednesday.

A California group representing businesses has filed a federal lawsuit challenging the federal government’s greenhouse emissions regulations for medium- and heavy-duty trucks.

U.S. cars and light trucks will be required to carry labels comparing estimated five-year fuel costs with those of the average new vehicle, the Department of Transportation and Environmental Protection Agency said Wednesday.