Satellite Data Exposes World's Worst Methane Mega-Leaks Driving Climate Crisis

Satellite Data Exposes World's Most Severe Methane Mega-Leaks Driving Global Heating

An exclusive analysis of satellite data has revealed the world's worst mega-leaks of the potent greenhouse gas methane in 2025, with researchers describing the lack of action to fix these easily preventable emissions as "maddening." The super-polluting plumes from oil and gas facilities have a colossal heating impact on the climate but often result from poor maintenance and can be simple to address.

Colossal Climate Impact from Preventable Leaks

The assessment found dozens of mega-leaks, each having the same global heating impact as a coal-fired power station. Researchers from the Stop Methane Project at the University of California, Los Angeles (UCLA) said stopping these leaks can even be free, given that captured methane - the "natural gas" that fires power stations - can be sold. "It is really maddening," said Cara Horowitz at UCLA. "These sites are the result of poor maintenance - if you upgraded the infrastructure a little bit, did good housekeeping, you could solve a really important part of the problem."

Turkmenistan Dominates List of Worst Offenders

The mega-leaks occur across the world, but the top 25 list is dominated by facilities in Turkmenistan. The scale of methane leaks in the secretive and authoritarian state has previously been described as "mind-boggling." Despite Turkmen officials claiming in October that methane mega-leaks had been reduced, the new analysis shows substantial emissions remain. "Management has placed this under special control, and leaks are being repaired locally within two to three days," said Muhammetberdi Byashiev, the head of the environmental protection department at the state company Türkmengaz.

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Global Distribution of Super-Polluting Plumes

Super-polluting plumes were also detected in multiple other countries:

• United States: The largest detected in 2025 occurred in Texas, leaking 5.5 tonnes of methane per hour, equivalent to running about a million fuel-guzzling SUVs
• Venezuela: Five mega-leaks from state-owned facilities
• Iran: Three mega-leaks from state-owned facilities

The Stop Methane Project also analysed super-polluting plumes from landfill sites, where rotting organic waste can release huge volumes of methane when not well managed. The worst sites ranged across the world, from Turkey to Algeria and Malaysia to the United States.

Methane's Critical Role in Climate Crisis

Methane emissions cause 25% of global heating today, and there has been a "scary" surge since 2007, according to scientists. They have warned that this acceleration seriously risks triggering catastrophic climate tipping points. However, cutting methane emissions has a rapid impact, because the gas is naturally removed from the atmosphere far quicker than carbon dioxide. Some experts call cutting methane the climate "emergency brake."

Satellite Technology Bringing Visibility to Invisible Problem

"Methane was the stealth pollutant gas for many years: invisible, out of sight and out of mind," said Horowitz. "But we can now see these tremendously powerful emissions using satellites and use that as a wake-up call for the world." The UCLA Stop Methane analysis is based on data from Carbon Mapper and found 4,400 significant plumes in 2025, each emitting more than about 100kg/hour, equivalent to running 20,000 SUVs.

Political and Economic Implications

"It's clear that Turkmenistan is trying to access the European market," said Horowitz. "European potential buyers should pay attention to our results and think of this as a 'buyer beware' moment." The EU is phasing in strict limits on methane leaks linked to imported gas. Mary Nichols, the former chair of the California Air Resources Board and a member of Carbon Mapper's policy and impact committee, said: "Methane is a more powerful climate villain than any other air pollutant because it acts quickly and is emitted in large volumes. It is also relatively cheap and easy to control."

Methodology and Data Collection

The analysis methodology involved:

1. Carbon Mapper using data from two satellites to measure plumes as they pass overhead
2. Leak rates from a plume on different days being averaged with days having no leaks taken into account
3. The Stop Methane Project only considering plumes detected at least twice
4. The top 25 oil and gas plumes were each detected an average of seven times
5. The top 25 landfill plumes were each detected an average of 11 times

Satellite limitations include inability to collect data at night or through heavy clouds, meaning not every plume may be detected. The researchers hope that by bringing visibility to these major issues, they will help increase public and political pressure to take action against these preventable climate disasters.