Fracking, the controversial technique for exploiting underground supplies of shale gas, does not appear to result in the contamination of groundwater supplies, according to an independent investigation carried out in the US.
The study found little evidence to support widespread fears in Britain and the US that fracking – in which shale gas is extracted by deliberating fracturing underground rock with toxic chemicals – can result in groundwater being contaminated. However, the American university scientists who carried out the investigation said they could not give fracking an entirely clean bill of health as the long-term effects of the process are so poorly understood.
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