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Posted Sat Jul 18 2009: from New Scientist:
Mystery methane belched out by megacities
The Los Angeles metropolitan area belches far more methane into its air than scientists had previously realised. If other megacities are equally profligate, urban methane emissions may represent a surprisingly important source of this potent greenhouse gas...a research team led by Paul Wennberg, an atmospheric chemist at Caltech in Pasadena, estimated methane emissions for the Los Angeles region, then subtracted all known sources of methane, such as livestock, landfills and sewage. They ended up with an enormous amount of methane – about 0.14 to 0.34 megatonnes per year, or up to half of the total emissions that could not be accounted for by known sources.
[Read more stories about: climate impacts, global warming, methane release]

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