The biggest shale-gas reserves may be lurking in China. At the end of last year the IEA estimated the country’s total recoverable resources at 50tcm, over 70% of it in shale beds, most of the rest coal-bed methane. China already extracts prodigious quantities of the latter—some 10bcm last year. Only a handful of test wells for shale gas have been sunk, and it looks as though the geology may make it harder to get at than America’s.
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