`` Dead zones '' lack enough oxygen to support marine life . Comment: See also : Floating turbine buoys offshore wind potential . Sweden trialling plan to pump oxygen into Baltic Sea -- world 's largest dead zone . Critics say it 's a distraction from the need to reduce pollution .
`` Dead zones '' lack enough oxygen to support marine life . Comment: Sweden trialling plan to pump oxygen into Baltic Sea -- world 's largest dead zone . Critics say it 's a distraction from the need to reduce pollution .