I'm talking about dead zones in the ocean. What is a dead zone in the ocean? It is an area along the sea floor where oxygen levels are so low they no longer sustain marine life. More and bigger dead zones are forming in the ocean because of industrial waste, fertilizer runoff from industrial agriculture and climate change. There are now more than 400 coastal low-oxygen areas around the globe, and the number of dead zones started to double roughly every decade beginning in the 1960s.
The most recently published research on dead zones shows that there are five to six very large (like over eight thousand square miles) dead zones.