In this TED talk, ocean expert Nancy Rabalais discusses the “dead zone” in the Gulf of Mexico - an area of the ocean where there isn’t enough oxygen to support sea life. Fertiliser runoff from farmland further up the Mississippi River is causing the dead zone, according to Rabalais. She says that solutions could include growing perennial grains and using precision fertilisation.
View the video here. See also the Foodsource resource How do food systems contribute to water pollution? You may also be interested in the news story Growing 'dead zone' confirmed by underwater robots in the Gulf of Oman.