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In a October 15, 2002 photo, years of erosion create a moon-like landscape on chat piles just west Picher, Okla. The Environmental Protection Agency has announced a pledge of more than $16 million annually for continued cleanup efforts of the Tar Creek Superfund Site in northeastern Oklahoma. (David Crenshaw/Tulsa World via AP)

In a October 15, 2002 photo, years of erosion create a moon-like landscape on chat piles just west Picher, Okla. The Environmental Protection Agency has announced a pledge of more than $16 million annually for continued cleanup efforts of the Tar Creek Superfund Site in northeastern Oklahoma. (David Crenshaw/Tulsa World via AP)

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