According to Helen Briggs of BBC News (full article here), record numbers of microplastics ( those less than 5mm long) have been discovered in arctic ice samples. Up to 17 different kinds have been found, demonstrating the breadth of this pattern of contamination. As this frozen water melts and the plastics return to the sea, these particles are gobbled up and by smaller fish and can make their way up the food chain. YIKES!
The Midwest Tech Blog 