The Los Angeles metropolitan region belches out far more methane than previously realised. If other megacities do too, urban methane emissions may represent an important source of this potent greenhouse gas.rnA team led by Paul Wennberg at the California Institute of Technology in Pasadena calculated methane emissions for the Los Angeles region, then subtracted out all known sources of methane, such as livestock, landfills and sewage.
展开▼