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Ocean currents

NASA put out a lovely video showing ocean currents over time from about 2007. While human decisions may not affect ocean currents very much, human decisions certainly affect carbon and water cycling. While carbon and water cycling are difficult to see, as complete cycles, the ocean current video may serve as a kind of visual representation, with a similar kind of turbulence or fractal geography, if you will, showing the interplay of chance and necessity.

Another NASA video about phytoplankton: