A worker performs a routine check to the valves at a natural gas appraisal well of Sinopec in Langzhong county, Sichuan province, in this file picture taken March 1, 2011. Just over a year ago, Beijing awakened to a technology revolution that has unlocked massive reserves of gas trapped within shale rock formations in the United States. China's confidence has been bolstered by a new report of its estimated reserves of shale gas, which shows them
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