Aliso Canyon natural gas storage facility in Los Angeles County, partial view. Photo/SoCal Gas

A giant leak at a natural gas storage facility in the Los Angeles area is reversing many of the efforts of California industry, businesses and schools to comply with increasingly stringent emissions rules.

Very large quantities of the potent climate changing gas methane are escaping from a well that is part of an extensive underground gas storage site serving Southern California. Dozens of families who live nearby have been evacuated.

Southern California Gas Co., a subsidiary of San Diego-based Sempra Energy, has 115 gas storage wells at the Aliso Canyon site, near Porter Ranch.

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