Each year, oil and gas industry operations in the U.S. are leaking roughly 60 percent more methane, a powerful greenhouse gas, into our atmosphere than previous estimates from the U.S. Environmental Protection Agency, which relied heavily on self-reporting by the industry.

That’s the conclusion of a study published today in the peer-reviewed journal Science and conducted with funding from the Department of Energy, NASA, and private foundations. The two dozen researchers involved found that the U.S. oil and gas supply chain releases between 11 and 15 million metric tons of methane per year.

“This study confirms the growing body of peer-reviewed science indicating oil and gas extraction’s methane pollution makes it as harmful to climate as coal burning’s carbon dioxide pollution,” said Dr. Anthony Ingraffea, Cornell University professor emeritus of engineering and vice president of Earthwork’s board of directors.

“This confirms there is no ‘bridge fuel’,” Ingraffea said. “To stave off catastrophic climate change we need to immediately drop all fossil fuels in favor of conservation and renewables.”

A Leaky System

Methane is a powerful and fast-acting greenhouse gas. Each ton of methane causes over 80 times the amount of climate warming as an equal amount of carbon dioxide in the first two decades after it enters the atmosphere. It’s also the primary ingredient in the natural gas that’s used to heat homes and to generate electricity — and when it leaks from oil and gas wells, pipelines, and other equipment, it can cause the world’s climate to grow hotter faster.

Even when methane is burned, it still has a globe-warming effect because it releases carbon dioxide emissions of its own. A “new, efficient” natural gas power plant generates about 40 to 50 percent as much carbon dioxide as a “typical new coal plant” when that gas is burned, according to the Union of Concerned Scientists — but the methane leaks in the supply chain come on top of that carbon pollution.

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