JAMES STEVENSON / SCIENCE PHOTO LIBRARY JAMES STEVENSON / SCIENCE PHOTO LIBRARY
Harbour flotsam at Honfleur, France: various types of non- biodegradable pollutants can be seen, including PVC (plastic bottles), expanded poly- styrene (packing material), aluminium (coca-cola cans). These contribute to the reduction in light and oxygen reaching the biota below the surface.
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