Shale Gas

A hydraulic fracturing drill rig lit up near Troy, Pennsylvania. Shale gas exploitation has been blamed for environmental problems including water, ground and air pollution and leaks of methane. Photograph: Jim Lo Scalzo/EPA

Nearly 2m homes in the UK will be heated by shale gas from the US within five years, under a deal agreed on Monday that is likely to be the first time major exports of the controversial energy source are used in the UK.The first deliveries, by tanker, are expected in 2018.Source- Guardian UK