Guardian: Most environmentalists are in no doubt. The new technology of fracking to extract shale gas from the rocks beneath our homes is both a nasty neighbour and a sure recipe for climate Armageddon. Not only that, fracking was pioneered in the US, the gas-guzzling land of climate sceptics. Fracking, or hydraulic fracturing, uses high-pressure water to shatter shale rocks and release natural gas lurking within. The gas is then piped to the surface. Shale rocks are widespread. But fracking requires lots...