The Aliso Canyon Oil Field, a natural gas storage facility in southern California, spewed an estimated 96,000 metric tons of methane into the air over the last four months, before it was temporarily capped this week. At its worst, the leak, which has been likened to the 2010 Deepwater Horizon oil spill, was responsible for a 25 percent increase in the state’s daily methane emissions. It also pushed hundreds of residents of the nearby Porter Ranch neighborhood out of their homes and prompted California’s governor to declare a state of emergency.

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