One of the biggest leaks of natural gas

Of course, it happened in California. It began on Oct. 23, 2015 in Aliso Canyon, outside of Los Angeles. It probably will not be stopped until this Spring. 

Methane – the main component of natural gas – is a powerful short-term climate forcer, with over 80 times the warming power of carbon dioxide in the first 20 years after it is released. Methane is estimated to be leaking out of the Aliso Canyon site at a rate of about 62 million standard cubic feet, per day. The daily leakage has the same 20-year climate impact as driving 7 million cars a day.

Here's an interesting chart developed by the Environmental Defense Fund.