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A possibly record-breaking, New Jersey-size dead zone may put a chokehold on the Gulf of Mexico this summer, according to a forecast released this week. Unusually robust spring floods in the U.S. Midwest are flushing agricultural runoff-namely, nitrogen and phosphorus-into the Gulf and spurring giant algal blooms, which lead to dead zones, or areas devoid of oxygen that occur in the summer. [Source: National Geographic News]
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