Natural Gas from Shale Contributes to Global Warming, Researchers Find
ScienceDaily (Apr. 13, 2011) Natural gas extracted from shale formations has a greater greenhouse gas footprint — in the form of methane emissions — than conventional gas, oil and coal over a 20 year period. This calls into question the logic of its use as a climate-friendly alternative to fossil fuels, according to Robert Howarth and colleagues, from Cornell University in New York.
Their work is published online in Springer’s journal, Climatic Change Letters.
Shale gas has become an increasingly important source of natural gas in the United States over the past decade. Shale gas is extracted by a high-volume hydraulic fracturing (fracking) process. Large volumes of water are forced under pressure into the shale to fracture and re-fracture the rock to boost gas flow. A significant amount of water returns to the surface as flow-back within the first few days to weeks after injection and is accompanied by large quantities of methane.
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