Photo Galleries
7 startups that want to improve your mental health From a text therapy platform to apps that push you reminders to breathe, these self-care startups offer help on a daily basis or in times of need. More
5 radical technologies that will change how you get to work From Uber's flying cars to the Hyperloop, these are some of the neatest transportation concepts in the works today. More
Royal wedding: How much will it cost? Meghan Markle's wedding to Prince Harry could cost millions once security is included in the bill. See how the costs break down. More
Special Offer

Green cars: The un-dirty dozen

Four Honda models made the American Council for an Energy Efficient Economy's annual list of the most environmentally-friendly cars.

1 of 12
BACK NEXT
Honda Civic GX
Honda Civic GX
Lowest base price: $24,590
The Civic GX is especially green for two big reasons. First, it's very fuel efficient, getting about 36 miles per gallon-equivalent of fuel. The second reason is that runs on compressed natural gas, not gasoline. (Hence, the gallon-equivalent number.)

Natural gas is cleaner-burning than gasoline and it also contains less carbon than gasoline per unit of energy. That means less C02, blamed as a contributor to global warming, coming out its exhaust pipe. Altogether, that gives the Honda Civic GX the highest "Green Score" rank, a spot it has held for five consecutive years.

Since you're unlikely to find a natural gas pump at your corner gas - as in gasoline - station, Honda also sells an at-home pump that taps into an owners home natural gas line. Plan your trip carefully if you go far from home, though.


NEXT: Toyota Prius
Last updated February 19 2008: 6:51 PM ET