It is possible to produce natural gas from shale rock in an "efficient and environmentally responsible manner," an ExxonMobil executive told the House Energy and Commerce subcommittee. The panel is scrutinizing the oil giant's plan to buy XTO Energy, a developer of the hydraulic-fracturing method of natural gas production. "If you remove hydraulic fracturing as one of the key enabling technologies, this resource could no longer be recovered," said CEO Rex Tillerson.

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