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Scientists warn of near-record "dead zone" in Gulf of Mexico following major flooding

The National Oceanic and Atmospheric Administration revealed that this year's area in the Gulf of Mexico that lacks enough oxygen to sustain marine life could be record-breaking. Donald Boesch, a professor of marine science at the University of Maryland, joined "CBSN AM" to discuss the significance of the "dead zone," what it means for wildlife and why it's so big this year.
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