In this April 30, 2007, file photo, a shovel prepares to dump a load of coal into a 320-ton truck at the Arch Coal Inc.-owned Black Thunder mine in Wright, Wyo. Two of the world's largest coal producers have announced a plan to combine their mining operations in Wyoming and Colorado in a bid to improve their competitiveness against growing natural gas and renewable energy sources. Arch Coal and Peabody Energy, both based in St. Louis on Wednesday, June 19, 2019, announced the joint venture. It will be 66.5% owned by Peabody and 33.5% owned by Arch. (AP Photo/Matthew Brown, File)
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