Plastic waste is a problem on our beaches. Hence, it is largely removed in a coordinated manner within a few weeks. However, it can litter other coasts of the world for many months to years due to unregulated waste disposal. Often the garbage on the beach is simply burned and a special form of plastic waste is created: so-called plastiglomerate.
Click here for original story, Plastiglomerates: Study demonstrates artificial rocks from macroplastics threaten ocean health
Source: Phys.org