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bullet Compressed natural gas
Compressed natural gas (CNG) is a fossil fuel substitute for gasoline (petrol), diesel, or propane/LPG. Although 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 may also be mixed with biogas, produced from landfills or wastewater, which doesn't increase the concentration of carbon in the atmosphere.
Date: 9/11/2012

bullet Natural gas vehicle
A natural gas vehicle or NGV is an alternative fuel vehicle that uses compressed natural gas (CNG) or, less commonly, liquefied natural gas (LNG) as a clean alternative to other automobile fuels. Worldwide, there were 11.4 million natural gas vehicles by 2009, led by Pakistan with 2.5 million, Argentina (1.8 million), Iran (1.7 million), Brazil (1.6 million), and India (935 thousand).
Date: 9/11/2012