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Wednesday, Aug. 8, 2007 01:47 am

Driving on natural gas

The Civic GX may be the cleanest mainstream car on the road

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Honda’s natural-gas-powered Civic GX may be the cleanest mainstream car on the road.
PHOTO COURTESY OF HONDA
Untitled Document Honda produces a natural-gas-powered Civic. What exactly comes out of the vehicle’s tailpipe, and how harmful to the environment is the extraction and refinement of natural gas? Which is greener, a hybrid or a car powered by natural gas?
Honda’s natural-gas Civic GX, which debuted in 2006 in California but is now becoming available in other parts of the country, just may be the cleanest mainstream car on the road — or at least the American Council for an Energy-Efficient Economy thinks so. The nonprofit group publishes an annual Green Book listing the greenest (and meanest) cars of the year, and it put the Civic GX at the top of its 2007 list of environmentally friendly cars, edging out Toyota’s hybrid Prius. Although neither car is a slouch when it comes to fuel economy and reduced emissions, the natural-gas-fueled Civic scored slightly better than the Prius on both counts in ACEEE’s battery of tests. It also scored better in terms of the pollution generated in the manufacturing processes. Natural gas is the cleanest-burning of all fossil fuels. According to the U.S. Department of Energy, the burning of natural gas emits 117,000 pounds per billion (ppb) BTUs of carbon dioxide, compared with gasoline’s 164,000. Its 92 ppb of nitrogen oxide emissions are considerably lower than gasoline’s 448, and its mere 1 ppb of sulfur dioxide emissions is dwarfed by gasoline’s 1,122. Natural gas also emits just 7 ppb of particulates, compared with 84 for gasoline, and it emits no mercury whatsoever against the trace amounts emitted by gasoline-burning engines. Natural-gas combustion does generate slightly more carbon monoxide than gasoline, at 40 ppb versus 33, but the difference is negligible. The big tradeoff for Civic GX owners is the car’s limited 220-mile range between fuelings. The gasoline-powered Civic can go 350 miles on a tank; the Prius, even with just an 11-gallon tank, can go considerably farther, operating at as much as 55 miles per gallon in highway driving. Although a few dozen natural-gas refueling stations have popped up around the United States, they are few and far between. For those who need to make longer trips but still value a greener ride, a hybrid may be the best bet, because it will produce only marginally worse emissions while taking advantage of the ubiquity of gas stations out on the road. Those who already use natural gas for home heating can pay $5,000 to have a car-fueling system installed in the garage or driveway. Although that cost may seem high, owners can save about $1 per gallon over gasoline and can also get a federal $1,000 tax rebate. (Also, as with the Prius, the purchase of the Civic GX itself qualifies for a federal tax break of $2,000, plus as much as another $2,000 in state and local incentives where applicable.) Some Honda dealers lease home systems for $34 to $79 a month. Honda pegs the fuel cost at 3.75 cents per mile, compared with 8.8 cents per mile for the gasoline-powered Civic. Regarding the extraction and distribution of natural gas, the fuel is often sourced along with or near oil reserves and involves similarly invasive drilling methods. Accidents do happen from time to time, and, though natural gas does not spill like oil and cause ground- and sea-level ecosystem disturbances, it rises into the atmosphere, where it contributes directly to global warming.
For more information: Database for State Incentives for Renewables and Efficiency, www.dsireusa.org; ACEEE’s Green Book, www.greenercars.com; Honda Civic GX, automobiles.honda.com/civic-gx.
Send questions to Earth Talk, care of E/The Environmental Magazine, P.O. Box 5098, Westport, CT 06881 or e-mail earthtalk@emagazine.com.
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