I've heard one of the biggest risks with global warming is that as the ocean water changes temperatures it has the potential to alter the flow of ocean water cu

I've heard one of the biggest risks with global warming is that as the ocean water changes temperatures it has the potential to alter the flow of ocean water currents. I'm wondering if this oil spill somehow has the potential to do the same thing. Maybe the change in consistency of the water in the gulf. Maybe the layer of oil on the surface will cause water temperatures beneath it. Maybe the lack of oxygen beneath the layer of oil will wreak some unknown consequences. Any good resources on this topic?