'Much more' shale gas than expected

An energy firm involved in controversial shale gas fracking has revealed it is sitting on up to 19 times more gas than previously thought.

IGas said it may have up to 172.3 trillion cubic feet (Tcf) of gas in a 300-square mile area in Cheshire it holds licences over. That compares with its previous estimate of about nine trillion cubic feet of natural gas.
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