The amount of methane leaking from natural gas emissions is far higher than previously estimated, a new study shows, more evidence, as one expert says, that urgent action must be taken to reduce these greenhouse gas emissions. ... "The study by Brandt et al. adds to a growing body of evidence suggesting that EPA's estimates of methane emissions from the oil and gas sector are too low," Sarah Uhl, Senior Project Director at the Clean Air Task Force, a Boston-based public health and environment advocacy group, said in a statement sent to Common Dreams.