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How much damage is the Porter Ranch leak doing to the climate?

How much damage is the Porter Ranch leak doing to the climate?

Stephen Conley has flown pollution-detecting airplanes over some of the largest oil and gas fields in the nation. But never before has the UC Davis scientist encountered as much methane in the air as in recent months over suburban Los Angeles.

Over and over, Conley has flown his single-engine plane through the invisible plume billowing from an underground natural gas storage facility and into Porter Ranch to provide California air quality officials estimates of the planet-warming emissions from the leak.

On the first flight, in November, methane levels above the community jumped to 50 parts per million, so high that Conley double-checked his...

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