Recent research has found that underwater seagrass collects up to 900 million plastic items in the Mediterranean Sea each year. Seagrass is vital in collecting and purging plastic waste into what are known as Neptune Balls. These balls of plastic pollution form naturally as the seagrass collects and traps plastics before releasing them in clumps, some of which wash back to shore. The study, which was published in Scientific Reports was lead by Anna Sanchez-Vidal, a marine biologist at the University of Barcelona.