Methane is an especially potent greenhouse gas, causing much more warming than carbon dioxide on a unit-for-unit basis—and a new, uniquely long-term study of emissions at a New Jersey landfill suggests that estimates of methane pollution in the U.S. and elsewhere may be dramatically off. The study , published by researchers at Columbia University's Lamont-Doherty Earth Observatory, which is part of the Columbia Climate School, used continuous ground-based measurements to determine that landfill methane emissions are likely much higher than current estimates. ...read more read less