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CNG has its positive aspects regarding the "environmental performance". OK, it's nowadays still mostly sourced from fossil reserves, but since it can be sourced locally in America its logistics are less energy-intensive than petroleum-derived fuels, so it's already a good advantage. CNG can also be sourced from biomass in sewage treatment stations and waste management landfills, so in a comparison to other biomass-based fuels it has an advantage because it doesn't have a higher impact on food production as ethanol and biodiesel are often pointed to do.
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