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US shale extraction technique under investigation

US oil and gas shale production - seen as a vital contributor to US energy needs - is under investigation due to environmental fears over extraction techniques.

The US House Energy and Commerce Committee this week launched an investigation into the potential effects of the hydraulic fracturing technique used to extract oil and gas from unconventional sources such as shale deposits.

On February 18, committee chairman representative Henry Waxman and subcommittee chairman representative Edward Markey sent letters to eight oil and gas companies that use

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