Congressional Research Service http://assets.opencrs.com/rpts/R40813_20090917.pdf [From summary] “Among the six gases that have generally been the primary focus of concern [in climate change research], methane is the second-most abundant, accounting for approximately 8% of total U.S. GHG emissions in 2007. Methane is emitted from a number of sources. The most significant are agriculture (both animal digestive … Continue reading »
