The leak by SoCal highlights the problems in this area. One of the articles lists this as a spill similar in scope to the Gulf Coast disaster, but since we can’t see it, it hasn’t gained the same focus. According to some sites its like putting an additional 7 million cars on the road.
The story about the pilot is fascinating.
The IBTimes article shows the 400 cites in the U.S., all vulnerable to the same
http://www.wired.com/2016/01/meet-scientist-flying-methane-leak/