Experts say fracking 'should continue with checks'

17 April 2012 Last updated at 14:12 ET Help

Despite previously triggering two earth tremors, a controversial method of extracting natural gas is set to be re-started in Lancashire.

The process, known as fracking, involves pumping water and chemicals into the ground to push out the gas.

Energy companies have said it will lead to cheaper energy supplies but critics argue that there are big risks.

David Shukman reports.

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