For folks who prefer to put natural gas directly into their vehicle rather than converting it to electricity first, CNG vehicles offer a cleaner alternative to gasoline power while still using a traditional powertrain. If you're looking for a sedan that runs on CNG, your current options are pretty limited - especially in the US - and you'll almost certainly be taking a look at Honda. The 2015 Honda Civic Natural Gas goes on sale starting November 19 in 37 states.
When most Americans think of green cars from Honda, the models that typically come to mind are the Insight and Civic Hybrids, or maybe the FCX Clarity. Few think of the natural gas-fueled Civic GX, probably because not many have ever heard of it. One group that has heard of the GX is the American Council for an Energy-Efficient Economy (ACEEE) which has placed it at the top of a list the dozen greenest vehicles currently available for sale in the U.S. Again.