PAT CORKERY / NREL / US DEPARTMENT OF ENERGY / SCIENCE PHOTO LIBRARY PAT CORKERY / NREL / US DEPARTMENT OF ENERGY / SCIENCE PHOTO LIBRARY
Compressed natural gas vehicle engine. Close-up of a compressed natural gas (CNG) engine in a Ford Crown Victoria car. CNG is mostly methane that has been greatly compressed to allow it to be used as a fuel. It is cleaner than other fossil fuels, and can be used in internal combustion engines that have been converted to burn this fuel.
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