Plastic fragments washed onto Schiavonea beach in Calabria, Italy, in a 2019 storm. Alfonso Di Vincenzo/KONTROLAB /LightRocket via Getty Images Christopher Ruf, University of Michigan Plastic is the most common type of debris floating in the world’s oceans. Waves and sunlight break much of it down into smaller particles called microplastics – fragments less than 5 millimeters across, roughly the …
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