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I think they also wrote in the article that its possible some biodegradation is going on in the older plastics we see ground down to particle size. Maybe some photo degradation. But, majority of it, like Bill noted, is being attributed to mechanical breakdown by wave action by the authors.
Its really scary stuff to me. Just think about it, if you've been eating sardines lately, and they were out there sifting phytoplankton sized plastic from the ocean, maybe you ate some plastic particles!
>Sarah
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"Seaweed is cool, seaweed is fun, it makes its food from the rays of the sun!"
"Wild means everyone owns it, and no one owns it." ~3rd grader
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