More planes = less global warming?

USA Today reports that greenhouse gas emissions from airplanes have actually gone down since 2000; even though there are more planes in the air.

The Environmental Protection Agency report measured the polluting gas from planes and vehicles between 2000-2006. It found that airplane emissions fell by 13 percent while vehicle emissions rose six percent:

"Airlines cut fuel consumption from a record 20.4 billion gallons in 2000 to 19.6 billion in 2006, Department of Transportation figures show. In that period, their planes flew 18% more miles on domestic and international routes. That marks the first extended period in which airlines have cut fuel use while flying more miles, DOT data show."

Read the full story: Planes fly more, emit less greenhouse gas