«A review of 20 years of technical literature on natural gas (NG) emissions in the United States and Canada comprising more than 200 papers has concluded that official inventories consistently underestimate actual CH4 emissions due to leakage from the natural gas system. “Atmospheric tests covering the entire country indicate emissions around 50 percent more than EPA estimates,” said lead author Adam Brandt at Stanford University. The study, which is authored by researchers from seven universities, several national laboratories and federal government bodies and other organizations, is published in the journal Science.