Marine dead zones

Ashley Boudreaux ties sandbags Friday, July 12, 2019, in Baton Rouge, La., ahead of Tropical Storm Barry. Barry could harm the Gulf Coast environment in a number of ways. But scientists say it’s hard to predict how severe the damage will be. (AP Photo/David J. Phillip)
July 14, 2019 - 9:58 am
Hurricane Barry could affect the environment of the Gulf coast and Lower Mississippi Valley in numerous ways, from accelerating runoff of farmland nutrients to toppling trees and damaging wildlife habitat and fisheries, scientists say. But the extent of the damage — and whether it will be at least...
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Water flows through Conowingo Dam, a hydroelectric dam spanning the lower Susquehanna River near Conowingo, Md., on Thursday, May 16, 2019. Officials once counted on the dam to block large amounts of sediment in the Susquehanna from reaching Chesapeake Bay, the nation's largest estuary, but the reservoir behind the dam has filled with sediment far sooner than expected. (AP Photo/Steve Ruark)
July 06, 2019 - 9:24 pm
CONOWINGO, Md. (AP) — When the Conowingo Dam opened to fanfare nearly a century ago, the massive wall of concrete and steel began its job of harnessing water power in northern Maryland. It also quietly provided a side benefit: trapping sediment and silt before it could flow miles downstream and...
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In this June 3, 2017 photo, Dr. Joan Perry of Kinston, left, answers a question during a debate with and state Rep. Greg Murphy, a Greenville physician, in Greenville, N.C. The two Republicans are running in a special primary election to be held July 9 for North Carolina's 3rd Congressional seat. (Deborah Griffin/The Daily Reflector via AP)
July 06, 2019 - 9:53 am
CONOWINGO, Md. (AP) — When the Conowingo Dam opened to fanfare nearly a century ago, the massive wall of concrete and steel began its job harnessing water power in northern Maryland. It also quietly provided a side benefit: trapping sediment and silt before it could flow miles downstream and...
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FILE - In this Sept. 27, 2013 file photo, the shoreline of Bay Jimmy, which was heavily impacted by the Deepwater Horizon oil spill, is seen in an area that has tar mats and oozing crude oil on the marsh platform, in Plaquemines Parish, La. This year's Gulf of Mexico "dead zone" is surprisingly small, but the oxygen-depleted water rose higher toward the surface than usual, scientists said Tuesday, July 31, 2018. (AP Photo/Gerald Herbert, File)
July 31, 2018 - 6:52 pm
NEW ORLEANS (AP) — This year's Gulf of Mexico "dead zone" is surprisingly small, but the oxygen-depleted water rose higher toward the surface than usual, scientists said Tuesday. Dead zones are areas in which water at and above the sea floor holds too little oxygen to support marine life. This dead...
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