04/01/2011 10:14 am ET Updated Jun 01, 2011

John Hickenlooper Backs 'Fracking,' With Caveat

GLENWOOD SPRINGS -- Gov. John Hickenlooper on Thursday defended the use of hydraulic fracturing in oil and gas development in Colorado but renewed his call for companies to disclose the substances in the fluids used in the process.

"For the life of me I can't figure out why they won't reveal those," he said as he took his state economic development tour to Glenwood Springs.

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