Sir, Yumehiko Hoshijima (Letters, March 21) is correct to challenge thè myth that shale gas is going to benefit cimiate change. If mediane emissions exceed 2 per cent of production, then thè advantage of buming gas over coal is lost. Satellite observations over thè US have demonstrated that exploratory fields release higher aniounts of methane tlian established fields, with losses over Bakken and Eagle Ford representing 10 per cent of production.

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