Methane, the main ingredient in natural gas, is escaping in vast volumes from oil and gas fields in the United States, Russia and other countries. The fracking rush in shale-gas country has amplified the threat. Some companies have found that investments in capturing the emissions quickly pay off in sales of the fuel.
http://www.youtube.com/watch?feature=player_embedded&v=iW6Fw8bLIu0
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