A study by the Havard Center for Risk Analysis comparing diesel vs. natural gas as fuels for heavy-duty trucks and buses found that each has a distinct advantage. Environmentally, natural gas is better at reducing particulate and NOx pollution, but diesel fuel is better for reducing greenhouse gasses, primarily because it is more fuel efficient than natural gas. Because natural gas is primarily methane, it combusts more completely than many fuels, producing fewer emissions of several ...
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