From Derek Bolton While I appreciate that Peter Aldhous's article was primarily concerned with the immediate health questions raised by the process of fracking, or cracking rock to extract natural gas from shale beds (28 January, p 8), its effects on climate change cannot be ignored since that, too, is likely to be bad for our health. As some of the incentives for fracking come from the lower carbon emissions produced by gas-fired power stations, a key question is whether the extraction of shale gas has an additional impact on greenhouse gas (GHG) emissions. This is something recent studies say should be taken into account given the methane leakage such extraction creates.
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