Research shows that up to 234 particles have been found concentrated into just one litre of melted Arctic sea ice. That's much higher than in the open ocean.
Researchers explain that sea ice forms from the top. By unfortunate coincidence, plastic particles also float at the surface, so they get bonded into the ice as it freezes
They are not yet sure how much of a threat this presents.
But they are worried about the impact on Arctic wildlife if the particles are released as sea ice continues to shrink.
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