Extremely potent greenhouse gas leaked from a Kazakh well for over six months.
One of the worst methane leaks ever recorded took place last year at a remote well in Kazakhstan, new analysis shared with BBC Verify has shown.
"The magnitude and the duration of the leak is frankly unusual," said Manfredi Caltagirone, head of the UN's International Methane Emissions Observatory. "It is extremely big." This particular methane leak was first investigated by the French geoanalytics firm Kayrros. Their analysis has now been verified by the Netherlands Institute for Space Research and the Polytechnic University of Valencia, in Spain.Luis Guanter from the Polytechnic University of Valencia, who helped verify the leak, says "only the Nord Stream sabotage may have led to a stronger leak".
In a statement, the Department of Ecology in the Mangistau region confirmed that the concentration of methane in the air exceeded legal limits on 10 separate occasions between 9 June and 21 September. The company says its well only contained a "negligible" amount of gas, and that any methane leaked would have burnt as it came out of the borehole.
According to the company, it suggests satellites could have mistaken other gases in the atmosphere - like water vapour - for methane, and that scientists did not account for methane already in the air before the blowout happened."We have tested the potential effect of water vapour or smoke, and we did not find any signal of those interacting with our measurements," said Mr Guanter from the Polytechnic University of Valencia.
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