A recent peer-reviewed study by scientists at Carnegie Mellon indicates that Marcellus gas is 20-50% cleaner than coal for producing electricity. This article links to the study and describes how it is different from an earlier Cornell study about the same topic.
###
New shale study refutes Cornell: Marcellus gas better than coal
PENNLIVE.COM
By Donald Gilliland
Wednesday, August 17, 2011
Marcellus gas has less impact on global warming than coal, according to a recent study by scientists at Carnegie Mellon University.
The peer-reviewed study published Aug. 5 in “Environmental Research Letters” appears to be a direct refutation of an April study from researchers Robert Howarth and Anthony Ingraffea at Cornell University that indicated that shale gas was worse for global warming than coal.
The Cornell study had a number of faults — acknowledged by its authors — including sketchy data that did not directly apply to Marcellus drilling operations.
The Carnegie Mellon study looks specifically at Marcellus and the “life cycle greenhouse gas emmissions” associated with its production and consumption.
Marcellus gas is essentially no different than conventional natural gas, the study found, and 20-50 percent cleaner than coal for producing electricity.
“Marcellus shale gas emits 50 percent fewer greenhouse gas emissions than any U.S. coal-fired plant,” said study co-author Chris Hendrickson. “We favor extraction of Marcellus shale natural gas as long as the extraction is managed to minimize adverse economic, environmental and social impacts.”
