More than two months after a natural gas storage well in Southern California began uncontrollably spewing methane gas, the governor of California has declared a state of emergency.

The well at the Aliso Canyon storage facility, just north of Los Angeles, is releasing tens of thousands of kilograms of methane per hour. An analysis in November showed the well, over the course of a month, put out a quarter of the state's total output of the potent greenhouse gas, reports NPR member station KPCC.

The leak isn't expected to be capped for months. It's invisible to the naked eye but can be viewed with infrared cameras.

Gov. Jerry Brown has declared the state of emergency based in part on the "prolonged and continuing" nature of the massive blowout, he said in a statement.

Brown has ordered the Southern California Gas Co. to identify a backup plan for stopping the leak if the current strategy — drilling relief wells, then filling the leak with mud and cement — doesn't work. He promised that the state will ensure the gas company covers all the costs of addressing the leak, without passing the expense on to consumers.

The governor is also initiating emergency regulations at gas storage facilities across the state, including regular inspection and testing and ongoing measurement of the gas flow within wells.

As we've previously reported, the leak raises concerns about environmental impact — methane is a greenhouse gas that warms the atmosphere far faster than carbon dioxide — as well as the health of residents at Porter Ranch, a nearby residential community.

Residents have complained of headaches, nosebleeds and nausea, and two nearby elementary schools have shut down. SoCal Gas is being sued for not quickly informing nearby residents about the leak.

The gas company, which acknowledges that the odorant in natural gas is "unpleasant" but maintains that the leak "does not pose an imminent threat to public safety," has paid to relocate thousands of families living near the breached storage facility. Demand for rental properties in the area has skyrocketed, and member station KPCC has reported on potential price-gouging.

Two weeks ago, Ingrid Lobet reported for NPR on how the leak was affecting local families — and why it's so hard to shut down.

The leak isn't tidy, an expert explained to Lobet: The escaping gas can't simply be siphoned off. And as the Los Angeles Times detailed earlier this week, the pressure of the escaping gas makes it impossible to stop the leak by filling the well from the top.

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