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Gas companies want to access the Marcellus Shale, one of the largest gas deposits in the nation, which lies under parts of New York, Pennsylvania, West Virgina and Ohio.

Yet the gas rush is facing staunch opposition because critics say the fracking could affect the upper Delaware River, pictured here, which provides clean water for 17 million people across Pennsylvania and New York.

Last updated September 10 2010: 4:00 PM ET
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