New Scientist: THE row over fracking for natural gas has hit the UK, with protests over plans in the village of Balcombe. Could they have a point? Studies are suggesting fracking could accelerate climate change, rather than slow it. The case for fracking rests on its reputed ability to stem global warming. Burning gas emits half as much planet-warming carbon dioxide as an equivalent amount of coal. That is why, after embracing fracking, CO2 emissions have fallen in the US. But leading climate scientists are warning...