Marcellus shale: Tapping its vast natural gas stores raises environmental fears


First Posted: 7/27/2010

So vast is the wealth of natural gas locked into dense rock deep beneath Pennsylvania, New York, West Virginia and Ohio that some geologists estimate it's enough to supply the entire East Coast for 50 years. But freeing it requires a powerful drilling process called hydraulic fracturing or "fracking,"using millions of gallons of water brewed with toxic chemicals that some fear threaten to pollute water above and below ground, deplete aquifers and perhaps endanger human health and the environment.See an interactive explanation of the Marcellus Shale formation and the gas drilling technology known as hydraulic fracturing.

Marcellus shale: Tapping its vast natural gas stores raises environmental fears

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