There are plastic shopping bags, bottles, toys, action figures, bottle caps, pacifiers, tooth brushes, boots, buckets, deodorant roller balls, umbrella handles, fishing gear, toilet seats and so much more. Plastic pollution is pervasive in Earth's oceans.

Researchers recently unveiled what they called the most scientifically rigorous estimate to date of the amount of plastic litter in the oceans — about 269,000 tons — based on data from 24 ship expeditions around the globe over six years.

"There's much more plastic pollution out there than recent estimates suggest," said Marcus Eriksen, research director for the Los Angeles-based 5 Gyres Institute, which studies this kind of pollution.