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In U.S. Methane Hot Spot, Researchers Pinpoint Sources of 250 Leaks
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Date:2025-04-17 15:10:26
Methane is escaping from more than 250 different oil and gas wells, storage tanks, pipelines, coal mines and other fossil fuel facilities across the Four Corners region of the U.S. Southwest, according to a study published Monday in the Proceedings of the National Academy of Sciences.
The findings help solve a puzzle that had preoccupied the study’s researchers since 2014. That year, they published research that flagged the region as one of the country’s largest sources of methane emissions, but they couldn’t determine the exact sources of the runaway gas.
The difference in this study, the researchers said, is that they used aircraft sensors allowing them to pinpoint the source of leaks within a few feet. The earlier paper relied on less precise, region-wide satellite data.
The research could help industry officials prioritize which leaks to repair first, since more than half the escaping methane came from just 10 percent of the leaks.
“It’s good news, because with the techniques that we have developed here, it’s possible to find the dominant leaks that we can target for methane emissions mitigation,” said lead author Christian Frankenberg, an environmental science and engineering professor at the California Institute of Technology.
Methane is a powerful short-lived climate pollutant that is 84 times more potent over a 20-year period than carbon dioxide. Curbing the release of the gas is a key component of President Obama’s climate plan. The goal is to cut methane emissions from the oil and gas sector, the biggest emitter in the country, by 40-45 percent by 2025.
The Four Corners region, where Utah, Colorado, Arizona and New Mexico meet, spans more than 1,000 square miles. It is one of the nation’s largest producers of coal bed methane and releases about 600,000 metric tons of methane into the atmosphere each year. That’s roughly six times the amount of methane that leaked from California’s Aliso Canyon well over several months beginning in late 2015. That event sparked evacuations, outrage and protests, and new regulation.
The study is the latest to show that a small number of “superemitters” mainly from oil and gas operations are responsible for the majority of U.S. methane emissions.
“It would be the rare case that [the superemitter phenomenon] has not been observed,” said Ramón Alvarez, a senior scientist with the Environmental Defense Fund. EDF has played a role in nearly 30 peer-reviewed studies on oil and gas methane emissions, but was not involved with this study.
The key now, according to Alvarez, is to determine whether the same high-emitting leaks persist over time or whether new ones keep cropping up.
“It becomes this kind of whack-a-mole effect,” Alvarez said. “You have to be on the lookout for these sites, and once you find them, you want to fix them as quickly as possible. But you have to keep looking, because next week or next month there could be a different population of sites that are in this abnormally high-emitting state.”
In the new study, for example, researchers detected the biggest leak at a gas processing facility near the airport in Durango, Colo., during one monitoring flight. Subsequent flights, however, failed to detect the same leak, suggesting emissions from the facility were highly sporadic.
If superemitting sites are short-lived and flitting—here one week, there another—constant monitoring and mitigation across the entire oil and gas sector will be required. Airplane-based readings are seen as too expensive for that work.
“We can’t predict ahead of time which facilities will leak,” said Robert Jackson, an earth system science professor at Stanford University who was not involved in the study. “Because we can’t, we need cheap technologies to monitor those facilities for when the leaks or emissions pop up.”
Jackson said recent developments in drone technology and satellites that allow for higher-resolution monitoring show promise.
“I think the time is coming when any person who is interested will be able to monitor not just oil and gas operations but lots of operations for different emissions and pollution,” Jackson said. “I really do think that day will be a good one.”
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