Travel by Train Instead

According to the U.S. Department of Energy (DOE), Amtrak is nearly 20 percent more energy efficient than commercial airlines and is continuing to improve as they swap diesel locomotives for electric ones.  Amtrak offers various passes so you can ride as far or as often as you want. Or pick a route that's made for exploring without a car, like the Adirondack from New York City. Many routes, like the Southwest Chief, have on-board National Park Service Trails & Rails programs. Amtrak also links up with its Canadian counterpart, VIA Rail, which offers flexible rail passes and great summer discounts.

Learn more at National Geographic's Green Guide