Study finds 14 million tonnes of microplastics on sea floor

Plastic pollution that ends up in the ocean deteriorates and breaks down, ending up as microplastics. Photo: AFP

The world's sea floor is littered with an estimated 14 million tonnes of microplastics, broken down from the masses of rubbish entering the oceans every year, according to Australia's national science agency.

The quantity of the tiny pollutants was 25 times greater than previous localised studies had shown, the agency said, calling it the first global estimate of sea-floor microplastics.