Rivers may be carrying more microplastics into the world's oceans than previously thought‎

Microplastics are a modern environmental menace and a potential threat to human health. These tiny pieces of plastic, measuring from 1 to 5,000 micrometers, come mainly from larger plastics as well as sources such as paints and cosmetics. They are found in almost every corner of the planet, and a new study published in Science suggests rivers may be carrying far more of them into the ocean than previously thought.