The search for cleaner energy sources for transportation has taken trucking in some interesting directions, but one source is often overlooked or even dismissed: renewable natural gas. It's methane gas produced by decomposing organic matter from sources like landfills, dairy farms, and wastewater treatment plants. It can be economically collected and used to power trucks. It's already a source of fuel for many refuse collection fleets. Hugh Donnell of Cummins Westport, maker of the engines that turn this harmful waste gas into motive power, describes the challenges and benefits of wider RNG adoption as a truck fuel.
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