The entire 'river of warm water' that flows from the Caribbean to the edges of Western Europe is dying due to the Corexit that the Obama Administration allowed BP to use to hide the scale of the BP Deepwater Horizon Oil Disaster.
The approximately two million gallons of Corexit, plus several million gallons of other dispersants, have caused the over two hundred million gallons of crude oil to mostly sink to the bottom of the ocean. This has hidden much of the oil, with the hopes that BP can seriously reduce the mandated federal fines from the oil disaster.
However, there is no current way to effectively 'clean up' the bottom of the Gulf of Mexico, which is about half covered in crude oil. Additionally, the oil has flowed up the East Coast of America and into the North Atlantic Ocean, and there is no way to effectively clean up this 'sea bottom oil'.
This massive amount of crude oil, covering such an enormous area, has seriously affected the Loop Current, the Gulf Stream, and the North Atlantic Current system, by breaking up the boundary layers of the warm water flow.