<img width="150" src="http://www.automotive-fleet.com/fc_images/articles/m-fritolay-cng-1.jpg" border="0" alt="
Fleets and natural-gas engine makers are already taking steps to address methane leakage. Photo: Frito-Lay
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Fleets and natural-gas engine makers are already taking steps to address methane leakage. Photo: Frito-Lay
">A recent study by West Virginia University's Center for Alternative Fuels, Engines, and Emissions found significant challenges for natural gas vehicles to deliver on their promise of emissions reductions, primarily due to the amount of methane they emit.
The study, Future Methane Emissions from the Heavy-Duty Natural Gas Transportation Sector for Stasis, High, Medium, and Low Scenarios in 2035, focused on NGVs currently in production, which researchers believe could significantly populate fleets by 2035.
Drawing on data gathered from a January 2017 study, WVU researchers looked at ways to reduce emissions during the pump-to-wheel process by using operational best practices.
Methane, which is more potent than carbon dioxide (CO2), contributes to 25% of manmade climate change, according to the Environmental Defense Fund. In 2015, the Environmental Protection Agency found that 31% of methane emissions came from petroleum and natural gas systems.
While methane has a shorter lifetime in the atmosphere — 12 years compared to CO2's 30 to 95 years — it traps more heat than CO2, according to EPA. However, lifetime in the atmosphere doesn't mean the time after which all the methane is gone, only that 63% of the initial amount of gas has been removed. Additionally, methane's global warming potential is 21, meaning it will trap 20 times more heat than CO2 over a 100-year period.
A 2015 study, published in Environmental Science & Technology, concluded that commercial fleets that converted from diesel to natural gas power could potentially accelerate the rate of climate change over the next 50 to 90 years before providing benefits to counteract it.
Similarly, the U.S. Energy Information Administration has reported that methane emissions grew by 27% from 1990 to 2009 due to natural gas consumption.
While methane leaks happen throughout