KNOTTINGLEY, ENGLAND – DECEMBER 18: Empty vending machines at Kellingley Colliery on December 18, 2015 in Knottingley, England. Kellingley began production in 1965 and is the UK’s last deep coal mine. Its closure will complete a carefully managed two-year plan for the UKs deep mines. This has been implemented by UK Coal with financial support from the British government. It follows a long period of difficult trading conditions largely due to low international coal prices. (Photo by Nigel Roddis/Getty Images)