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 13, 2019 - 11:14 pm
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...
Read More
FILE - This file satellite image provided by NASA and taken by U.S. astronaut Christina Koch on Thursday, July 11, 2019 at the International Space Station, shows Tropical Storm Barry as it bears down on Texas, Louisiana, Alabama and the panhandle of Florida as it makes its way through the Gulf of Mexico. 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. (Christina Koch/NASA via AP, File)
July 12, 2019 - 9:28 pm
Tropical Storm 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. That's because three distinct factors are coming together at once. The storm is expected to create a surge of up to 3 feet (1 meter) and bring...
Read More
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 - 6:24 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...
Read More
July 31, 2018 - 1:14 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...
Read More