Chongqing, China. 21st Apr, 2014. Workers disassemble facilities after a trial operation at the Fuling work zone in a branch company of Sinopec, China's largest oil refiner, in Chongqing, southwest China, April 21, 2014. The daily shale gas output in southwest China's Fuling work zone has exceeded 2.7 million cubic meters in April, setting a new record. © Liu Chan/Xinhua/Alamy Live News

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