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In 1972, the United States and Canada signed the Great Lakes Water Quality Agreement that’s designed to address the continuing contamination of the Great Lakes Basin ecosystem. The agreement prohibits off-shore oil drilling in all the Great Lakes, but there’s another kind of oil drilling going on under the lakes. It’s called slant drilling, and some Michigan residents say it’s a way to subvert the law. The Great Lakes Radio Consortium’s Wendy Nelson explains.

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