"California Gov. Jerry Brown declared a state of emergency Wednesday for a methane leak that has emerged from a mountain for months, making nearby residents sick.
The natural gas leak started with an eruption at a storage well underneath a mountain in Southern California's Aliso Canyon on Oct. 23, 2015, according to the Environmental Defense Fund. Since then, about 80,000 metric tons of methane have leaked into the air, which, in addition to polluting the air with a greenhouse gas, has caused health problems for people in Porter Ranch.
"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," said the EDF. "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."