Here's a photo caption you don't see every day. You'd almost think it came from The Onion.
The photo just came across the wire showing a long line of cars driving toward rolling mountains:
Visitor's to Great Smoky Mountains National Park travel through Pigeon Forge, Tenn., in this April 26, 2001, file photo. Scientists believe the Smoky Mountains were named because of the haze of isoprene, a visible hydorcarbon emitted from trees.
New research suggests trees play a more complicated role in air pollution than previously thought, with some species shown to worsen smoggy conditions that pose a health risk to humans.