To: Metacomet who wrote (249212 ) 4/16/2014 4:44:55 PM From: T L Comiskey Respond to of 542176 Energy.................... The Environmental Protection Agency is significantly underestimating the amount of methane that natural gas drilling operations emit, according to a new study published this week in the Proceedings of the National Academy of Sciences. The research, which has 13 co-authors from several academic and research institutions, used an aircraft to monitor emissions at several drilling sites in southwestern Pennsylvania in June 2012. Their evaluation found that methane emissions at the sites were 100 to 1,000 times greater than the EPA's estimate of how much methane the sites emit per second. Methane is a potent greenhouse gas, with 20 times more heat-trapping potential than other gases such as carbon dioxide. The Los Angeles Times covered the study Monday evening: Known...Unknowns........... Microbes.... Scientists have struggled to understand exactly what caused the long, slow, mass die-off in this dark era of our planet's history. The geologic record tells us there was a sharp uptick of C02 levels at the time. That would have caused the oceans to acidify and the Earth to heat up, making the environment inhospitable for most forms of life. But what actually caused the C02 levels to rise has remained a mystery. Some scientists have suggested an asteroid impact could be to blame; others have proposed that volcanic activity or coal fires might be the culprit. Now, in a paper published this week in PNAS, researchers from MIT and the Chinese Academy of Sciences in Nanjing, China, have fingered a new and unlikely suspect -- a tiny methane-spewing microbe known as Methanosarcina .touch.latimes.com