Mystery methane belched out by megacities

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Los Angeles methane smog pollution

Los Angeles baignée dans un nuage de pollution. Le méthane est un gaz dont l’effet de serre sur 100 ans est 25 fois plus puissant que le CO2. © David McNew/Getty Images/AFP

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.

New Scientist

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