Quote:
Originally Posted by Dartskipper
In 1975 the Oceans I sailed across had rather large particles of plastic polluting them, including those Styrofoam cups. And that was just over halfway across the Atlantic. I was very disappointed to find the Pacific was just as bad heading North from Panama. We passed a turtle contemplating one of those Styrofoam atrocities of Baja California. So sad.
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Those large pieces of plastic in the sea may be a threat to wildlife but do not pose an immediate threat to humankind. It is when they are broken down by the action of sunlight and the sea into microscopic nano-particles that they impact on us. Have a look
here