MSN: Using new technology to tap huge underground deposits holds the promise of American energy independence -- along with worries of environmental harm and health threats. The stakes couldn't be higher.
Fracking. The mere utterance of the word thrills investors in energy companies making big oil and gas finds in shale deposits in Texas, the Appalachians and North Dakota.
It makes environmentalists shudder because it involves so many unknowns.
But make no mistake: Fracking is a big deal. It has...