Climactic Change Letters

Fri, 2011-09-09 15:04Carol Linnitt
Carol Linnitt's picture

Reliance on Unconventional Gas is No Good for Climate, Says Scientist Tom Wigley

A partial shift from coal to unconventional gas on a worldwide scale will continue to accelerate climate change for a significant amount of time, according to Tom Wigley of the National Center for Atmospheric Research (NCAR). An increased reliance on gas would eventually reverse the warming trend but would only decelerate climate change by a few tenths of a degree. According to Wigley’s findings, that miniscule change will only feasibly occur sometime between 2050 and 2140, depending on the severity of fugitive methane from gas drilling, processing, and transport operations. 

Tom Wrigley, senior research associate at NCAR, is due to publish these findings next month in the peer-reviewed journal Climatic Change Letters. The journal recently received significant attention on this topic after publishing the striking findings of Professors Robert Howarth and Anthony Ingraffea. The Cornell University scientists performed a lifecycle analysis of the major fossil fuels to discover that unconventional gas offers little to no climate advantage over coal. 


The hotly contested findings sent a shock wave through the gas industry and environmental community alike, challenging the notion that the continent’s vast reserves of unconventional gas could or should serve as an alternative, interim fuel during the switch to a low-carbon economy. Wigley’s findings also pose a significant challenge to this assumption.
 
“Relying more on natural gas would reduce emissions of carbon dioxide, but it would do little to help solve the climate problem,” Wigley told Science Daily. “It would be many decades before it would slow down global warming at all, and even then it would just be making a difference around the edges.”
Sat, 2011-07-16 10:44Carol Linnitt
Carol Linnitt's picture

Post Carbon Institute Analysis Suggests Shale Gas (Still) Worse Than Coal For Climate

Shale gas cannot provide a low carbon “interim” fuel for the transition to a clean energy future, according to David Hughes, fellow at the Post Carbon Institute (PCI). Gas advocates have long advertized unconventional gas as a clean alternative to coal and other polluting fossil fuels. But the cleanliness of unconventional gas is challenged by others who claim that lifecycle greenhouse gas (GHG) emissions from shale gas are in fact higher than coal. 

One such claim, maintained by a group of scientists from Cornell University led by Dr. Robert Howarth, puts shale gas GHG emissions 20 to 100 percent higher than coal on a 20-year timeframe. Their study, published in the peer-reviewed Climactic Change Letters, has received enormous criticism from the gas industry and its supporters. Several reviews have challenged the integrity of the Cornell study, including a presentation given by scientist Timothy Skone from the National Energy Technology Laboratory (NETL). According to Skone, GHG emissions from gas are 48 percent lower on a 20-year timeframe.

In an analysis entitled “Lifecycle Greenhouse Gas Emissions From Shale Gas Compared to Coal,” Hughes compares the two conflicting conclusions to get to the source of the disparity. With a little number crunching, he discovers that there may be less of a disagreement than meets the eye.

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