Tonight: The Truth About Fracking

Fuel companies say drilling for gas and oil using a process known as fracking is clean, safe and could meet the UK's energy needs. Recent exploratory drilling in Sussex has sparked high profile anti-fracking protests amid fears about its impact on the environment. So what exactly is fracking - and why are people so concerned about it? Fiona Foster travels to a town in Pennsylvania in the US where fracking is dividing the community, despite the fact that it is cutting domestic fuel bills by up to a third.