Microplastics Pose Risk to Ocean Plankton, Climate, Other Key Earth Systems

An estimated 12 million metric tons of plastic currently enters the ocean each year. This plastic debris gradually breaks down into smaller and smaller fragments — micro- and nanoplastics — which, while less visually striking, can have serious effects on marine ecosystems and may even pose a threat to the stability of Earth’s climate. A recent estimate suggests that as much as 358 trillion microplastic particles are floating on the surface of the world’s oceans, with untold trillions more in deeper reaches.