The Hail Creek mine spewed between 123,000 and 263,000 metric tons of methane last year, according to scientists at the SRON Netherlands Institute for Space Research.
Just inland of Australia's east coast, roughly 200 miles from the Great Barrier Reef, a single coal mine run by Glencore emitted so much super-warming methane in a year that it had the same climate-warming impact as the annual pollution from more than 4 million U.S. cars.