Measurements of Methane Emissions at Natural Gas Production Sites in the United States, a September 16 report by the University of Texas at Austin, found that natural gas methane production well leaks are lower than past estimates. Compared to a 2010 study that found domestic leakage at .6 to 3.2 percent, the University of Texas study found that .42 percent is emitted. The report continues that when burned for electricity, natural as production emits half the carbon dioxide of coal.