It’s estimated that the natural gas leak in Porter Ranch, California, has released the equivalent of 2.1 million metric tons of carbon dioxide since it was reported in October.

That’s more greenhouse gas than 44,000 cars emit in one year, the Los Angeles Times reports. The leak is from a failed well at the Southern California Gas Company’s Aliso Canyon storage facility, and has caused thousands of Porter Ranch residents to temporarily move. In November, Stephen Conley, a scientist at UC Davis, flew over Porter Ranch for the first time, finding methane levels at 50 parts per million, an amount so high, he told the Times, he had to double-check his instruments. “This is probably 20 times bigger than anything else we’ve measured,” he said.


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