is another factor that i think that is critically is another factor that i think that is critically important. this overturning current in the southern ocean overturning current in the southern ocean around the antarctic performs a very ocean around the antarctic performs a very important function for the remaining a very important function for the remaining well population of the world remaining well population of the world because it brings up nutrients from the world because it brings up nutrients from the bottom of the ocean to the surface from the bottom of the ocean to the surface due from the bottom of the ocean to the surface due to this overturning current~ surface due to this overturning current. and the result is that we get a current. and the result is that we get a green current. and the result is that we get a green layer of plankton on the surface, get a green layer of plankton on the surface, krill forms as a result and this is surface, krill form