autobloggreen is reporting that several US cities will soon have compressed natural gas taxis roaming their streets.  The Ford Transit Connect is fueled by clean-burning compressed natural gas (CNG) and several cab companies are buying them for their fleets.  These vehicles are already on the road in Los Angeles and Chicago and are soon expected to be picking up passengers in Connecticut, St. Louis, Las Vegas and Philadelphia.

CNG is a fossil fuel substitute for gasoline, diesel and propane. While its combustion does produce greenhouse gases, it is a more environmentally clean alternative to those fuels, and it is much safer than other fuels in the event of a spill (natural gas is lighter than air, and disperses quickly when released).

CNG is used in traditional gasoline internal combustion engine cars that have been converted into bi-fuel vehicles (gasoline/CNG).  It is rising in popularity in the Asia-Pacific region, Latin America, Europe and the US due to rising gasoline prices. It is mostly found in taxis, trucks, buses and trains.

For more on CNG see here.

UPDATE

GM announces it will be bringing out bi-fuel full-sized pickup trucks in late 2012.  They will run on both gasoline or CNG.

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