What's been pumped into the Caribbean is the efluent from the Mississippi delta which consists of huge amounts of phosphate and sulfate from upriver. Huge amounts of waste from city streets all washed down gutters into the sewer we call the Gulf Coast. Waste from Petroleum and chemical refineries ... and thus the area is often called the dead zone.

Try this search on google.
"Dead Zone" and "Gulf Coast"

Of course I'm just a commie-pinko running dog paper tiger socialist eco-freak who hates America and none of this is really a problem.

DA Morgan