http://feeds.sciencedaily.com/~r/sciencedaily/~3/8tTme9_ccDo/150520114313.htm

Some major trucking companies are turning to natural gas to fuel their fleets — and to earn ‘green’ credit among customers. But celebrating lower emissions could be premature, according to a recent analysis. Researchers have found that converting heavy-duty trucks to run on natural gas could lead to negative climate impacts if steps are not taken to improve engine efficiency and reduce methane emissions from the fuel’s supply chain.

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