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Welsh MPs on fact-finding mission to shale gas site

6 February 2014 Last updated at 19:51 GMT

Welsh MPs have visited a shale gas site in Lancashire as part of their inquiry into energy provision.

The UK government is currently issuing a new round of licences to allow companies to explore for oil and gas.

But there are economic and environmental concerns about "fracking" which involves extracting gas from shale rocks underground.

Environment correspondent Iolo ap Dafydd reports.