A Cornell study published online in the journal Climatic Change argues methane leaking during shale gas production does more harm to the environment than burning coal.
A paper written by Gregory Staple, chief executive officer of American Clean Skies Foundation, and Joel Swisher, a director at Camco International, a climate change and sustainable development company, finds flaws in the Cornell study.
They claim the Cornell study used a "theoretical" model to compare the estimated greenhouse gas footprint of shale to coal.
"(T)he Staple-Swisher study found that, using the latest Department of Energy data on electricity generation, the fuel chain emissions from existing gas-fired power is still about 52 percent less GHG intensive on average than is existing coal-fired generation," they claim.
Natural gas emits half of the amount of carbon dioxide as coal. During extraction, however, methane is released, which is far more damaging to the environment than CO2, the Cornell study suggested.
The U.S. Energy Information Agency finds shale gas production will make up about half of the total natural gas production in the United States during the next 25 years.
U.S. lawmakers expressed concerns, meanwhile, that some of the chemical used during fracking, the process used to extract natural gas from shale rock formations, are carcinogenic or otherwise harmful.