A single gas well leak is California's biggest contributor to climate change

Rupture of Aliso Canyon well has released more than 77,000 metric tons of methane and refocused attention on America's accident-prone infrastructure

The single biggest contributor to climate change in California is a blown-out natural gas well more than 8,700ft underground, state authorities and campaign groups said Monday.

The broken well at the Aliso Canyon natural gas storage site has released more than 77,000 metric tons of the powerful climate pollutant methane since the rupture was first detected on 23 October, according to a counter created by the Environmental Defense Fund.