No matter how you drill it, using natural gas as an energy source is a smart move in the battle against global climate change and a good transition step on the road toward low-carbon energy from wind, solar and nuclear power.
That is the conclusion of a new study by Cornell Professor Lawrence M. Cathles, published in the most recent edition of the peer-reviewed journal Geochemistry, Geophysics and Geosystems. Cathles, a faculty member in Cornell's Department of Earth and Atmospheric Sciences, reviewed the most recent government and industry data on natural gas "leakage rates" during extraction, as well as recently developed climate models.
He concluded that no matter the time-frame considered, substituting natural gas energy for all coal and some oil production provides about 40 percent of the global warming benefit that a complete switch to low-carbon sources would deliver.
"From a greenhouse point of view, it would be better to replace coal electrical facilities with nuclear plants, wind farms and solar panels, but replacing them with natural gas stations will be faster, cheaper and achieve 40 percent of the low-carbon-fast benefit," Cathles writes in the study. "Gas is a natural transition fuel that could represent the biggest stabilization wedge available to us."
Cathles study, "Assessing the Greenhouse Impact of Natural Gas," includes additional findings about expanding the use of natural gas as an energy source, and the climate impact of "unconventional" gas drilling methods, including hydraulic fracturing in shale formations. They include:
"The most important message of the calculations reported here is that substituting natural gas for coal and oil is a significant way to reduce greenhouse forcing, regardless of how long the substitution takes," Cathles writes. "A faster transition to low-carbon energy sources would decrease greenhouse warming further, but the substitution of natural gas for other fossil fuels is equally beneficial in percentage terms no matter how fast the transition."
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