Comment So? (Score 5, Interesting) 184
This has been going on for a long time. It's due to drainage of basically the Great Plains out into the Gulf. Lots of fixed nitrogen from fertilizers in that these days. That nitrogen stimulates a variety of organisms that also use oxygen. Which there really isn't all that much of in water.
The only way you are going to stop it is to find a different method of raising food for the world. Hint: current organic methods doesn't do it - too labor intensive and yields suffer.
Or you could have less people.