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FILE – In this July 13, 2019 file photo, Chris Nguyen and his father, Trung, look at the moving water that breached the top of a levee in Plaquemines Parish just south of New Orleans as Hurricane Barry makes landfall along the coast. Scientists are back from measuring the Gulf of Mexico “dead zone” where there’s too little oxygen to sustain marine life in a large underwater area starting at the sea floor. One big question is whether Hurricane Barry reduced the size from a predicted near-record 7,800 square miles. That June forecast was based on measurements of fertilizer and other nutrients carried by Midwestern floods to the Mississippi River. But tropical storms roil the water, mixing in oxygen. (Chris Granger/The Advocate via AP, File)