Sen. Bob Casey, D-Pa., said he will support a bill that would require natural gas drillers to disclose the chemicals used in hydraulic fracturing. "Pennsylvanians have a right to know what is being injected into the ground at thousands of sites across the commonwealth," he said. But Kathryn Klaber, head of the Marcellus Shale Coalition, said companies have nothing to conceal and do not oppose disclosure.

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