But there is a much more potent greenhouse gas, methane, which is much more efficient at trapping radiation than CO2. Some estimates put it at eighty seven times more potent over a twenty year lifetime than carbon dioxide.
And who is the biggest culprit for releasing methane in the US? It is the oil and gas industry, which is the largest industrial source of methane pollution in the country, releasing 33 percent of all methane emissions in 2014.
There are a staggering amount of old and new wells with the potential to release methane. At least 3.5 million wells have been drilled in the US, with a quarter of those still active. Many old and new ones are leaking the potent greenhouse gas. Adding to the problem, there will be thousands of old wells leaking methane which the authorities do not even know the whereabouts of.
First let’s look at existing wells.
A new report, published by the Center for American Progress yesterday, reveals that the onshore oil and gas industry’s methane emissions totalled more than 48 million metric tons of carbon dioxide equivalent, or CO2e, in 2014.
To put this into perspective, this is the equivalent of 14 coal-fired power plants powered for one year.
The worst culprits were ranked in order and came out as: ConocoPhillips, Exxon, Chesapeake Energy, EOG Resources and BP.
Concern has been growing about the oil industry’s methane emissions for a while. Last month, the US Environmental Protection Agency, or EPA, finalized limits on methane emissions from new sources in the oil and gas sector. Indeed, the Obama administration has set a goal of reducing methane emissions from the oil and gas sector by 40 percent from 2012 emissions levels by 2025.
The biggest emitters were not necessarily the biggest natural gas producers. For example, ConocoPhillips was the sixth largest natural gas producer in 2014.
The parts of the country experiencing the worse methane pollution are of course the main oil and gas producing areas including the following: the Anadarko Basin of Colorado, Kansas, Oklahoma, and Texas; the Gulf Coast Basin of Louisiana and Texas; the San Juan Basin of Colorado and New Mexico; the Permian Basin of New Mexico and Texas; and the Appalachian Basin in the eastern part of the United States.
But now let’s look at old wells.
There are other areas too which are suffering from chronic methane leakage from old wells. Yesterday, Bloomberg ran an article on the problems of methane leakage affecting Pennsylvania, the birthplace of the U.S. oil industry, where “century-old abandoned oil wells have long been part of the landscape”.
Bloomberg reports that these abandoned wells as now the “focus of growing alarm”, especially ones close to the new fracking fields, due to them leaking methane.
“We had so much methane in our water, the inspector told us not to smoke a cigar or light a candle in the bath,” Joe Thomas, a machinist, whose 40-acre farm has at least 60 abandoned wells, tells Bloomberg.
Pennsylvania’s Attorney General is now reviewing the rules requiring drillers to document wells within 1,000 feet of any new potential fracking site. The obvious worry is that abandoned wells might interact with new fracking wells, creating an easy methane escape route from the frack well. And in Pennsylvania only ten per cent of abandoned wells are documented.
One person searching for these abandoned wells is Laurie Barr, who co-founded Save Our Streams Pennsylvania. Over the last five years she has located almost 1,000 wells, most of which were not recorded.
Bloomberg quotes Mary Kang, a postdoctoral fellow at Stanford University in California who co-authored a widely cited paper on methane leakage from Pennsylvania’s wells. “These old wells are emitting methane into the atmosphere, and they are worth considering in greenhouse-gas emissions inventories,” she said.