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. In the US, nine of the 10 worst leaks were in Texas.
“Americans should be surprised and angered by the fact that the US lands pretty high on this list of top super-polluting plumes,” said Horowitz. “We in the US tend to think of our industry as fairly well and cleanly run, but this shows that we still have work to do.”
The super-polluting plume in Texas appears to be operated by Energy Transfer. The company did not reply to a request for comment.









