The Ocean's Cleaners
This talks of the surprisingly clean ocean floors and why it happens. The sea currents that pump vast quantities of water from the equator to the poles and then back again can be thought of as the circulatory system of the world. The water movement dilutes and distributes any pollutants, transporting nutrients from the polar waters to the equatorial seas.
http://www.thenakedscientists.com/HTML/articles/article/the-ocean-s-cleaners/
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