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Posted Thu Mar 7 2013: from Environmental Defense Fund:
Study Intends To Determine Methane Leakage Associated With A Growing Natural Gas Transportation Sector
In a paper published last year, EDF scientists and other leading researchers examined the impact of potential fugitive emissions on the climate benefits of a switch from diesel to natural gas heavy-duty trucks. The study found that, according to the best available data, methane leak rates would need to be below 1 percent of gas produced in order to ensure that switching from diesel to natural gas produces climate benefits at all points in time. They also found that - using the EPA leakage rate estimates at that time - converting a fleet of heavy duty diesel vehicles to natural gas would result in increased climate warming for more than 250 years before any climate benefits were achieved. EDF is working with leading researchers and companies in a series of studies designed to better understand and characterize the methane leak rate across the natural gas supply chain. The studies will take direct measurements at various points across the production, gathering and processing, long distance transmission and storage, local distribution, and transportation. The first study, led by researchers at the University of Texas, is measuring emissions from natural gas production. Results will be released in the coming months.
[Read more stories about: methane release, airborne pollutants]

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