‘Dead Zones’ are areas of low-oxygen levels in the ocean, caused by nutrient pollution. The world’s second-largest dead zone forms every summer in the Gulf of Mexico, thanks to runoff from farms and sewage treatment plants. While the pollution kills aquatic life in the dead zone, it can also kill fish and cause algae blooms upstream.

Last week, members of the Mississippi River Collaborative were in Louisville to discuss the dead zone and other water issues. I spoke with Kris Sigford of the Minnesota Center for Environmental Advocacy and Tim Joice of Kentucky Waterways Alliance.Listen to the interview