Ministers prepare to announce UK 's shale-gas reserves are much larger than previously estimated . Score: Last year , the government commissioned the British Geological Survey to produce a new estimate of Britain 's shale-gas reserves , which is understood to show that they are much larger than previously thought . 6 Fracking is extraction of gas and oil by pumping water at high pressure into shale rock .
Ministers prepare to announce UK 's shale-gas reserves are much larger than previously estimated . Score: 6 Fracking is extraction of gas and oil by pumping water at high pressure into shale rock .