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Mossville: When Great Trees FallToxic fumes and pollution from petrochemical plants force generations of African American families to leave Mossville, La.

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Now PlayingMossville: When Great Trees FallToxic fumes and pollution from petrochemical plants force generations of African American families to leave Mossville, La.0The Secret Science of SewageDr. George McGavin and Dr. Zoe Laughlin explore one of the U.K.'s biggest sewage works that processes one billion liters of wastewater flushed each day.