UNITED NEWS INTERNATIONAL (UNI) — Experts say the Mediterranean Sea is on its way to becoming one of the most polluted oceans in the world.

According to a new report from the World Wildlife Fund, the 200 million tourists who visit the Mediterranean every year are responsible for a 40 percent increase in marine litter — most of which is plastic.

The report says that while the Mediterranean holds just one percent of the world’s water, it’s become a dumping ground for seven percent of the world’s microplastic pollution.

The issue comes full circle, as the WWF concludes that tiny microplastic particles are being eaten by marine animals like fish, which are in turn eaten by tourists.

The WWF released the report on World Oceans Day, June 8.

WWF researchers urged Mediterranean visitors to do their part in keeping the sea clean by saying “no” to single-use plastics and switching to reusable products.