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Compressed Natural Gas (CNG)FactsCNG is homegrown. Currently, over 99% of natural gas used in the US comes from North American sources. However, demand is rising, and foreign supplies may have to be tapped in the future. As with ethanol, you must buy a vehicle capable of processing the fuel source. However, natural gas can be blended with hydrogen as a fuel. Commercially available natural gas engines have been shown to reduce various types of emossions -- carbon monoxide (CO), particulate matter, and nitrogen oxides.[details] |
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