The gas leak that forced the evacuation of 1,800 homes in the mountains above Los Angeles in late 2015 was the largest methane leak in U.S. history and shows the climate risks of aging natural gas infrastructure, according to a study published Thursday in the journal Science.

The Aliso Canyon leak near the Porter Ranch neighborhood was so big that it emitted 97,100 tons of methane — the equivalent of the annual greenhouse gas pollution from 572,000 cars, according to the study, which used aircraft to measure methane concentrations in the atmosphere near Aliso Canyon during the leak.

more at Source: California gas leak was largest of its kind in U.S. history, study shows