A dead zone the size of Rhode Island in the Gulf of Mexico because of chemical fertilizers? Hard to imagine, but absolutely true.
Every year towards fall, a phenomenon takes place in the Gulf of Mexico. As chemical fertilizers run off into streams and tributaries of the Mississippi River, they make a long journey south, and eventually are dumped into the gulf. As levels of nitrogen and phosphorus rise they feed algae, which in turn, literally, creates an area the size of Rhode Island that is void of any life whatsoever. It is impossible for any aquatic species to exist due to the lack of oxygen in the water.