When it rains heavily, plastic waste is washed off our streets into rivers, flowing out to the ocean. Most plastic is trapped in estuaries and coastal ecosystems, with a small fraction ending up offshore in the high seas. When it rains heavily, plastic waste is washed off our streets into rivers, flowing out to the ocean. Most plastic is trapped in estuaries and coastal ecosystems, with a small fraction ending up offshore in the high seas. Environment Phys.org – latest science and technology news stories