Microplastics, very small plastic fragments, less than 5 millimetres in length, can be found in several places. And there’s a lot of it. A 2015 study showed that there are between 93 and 236 metric tons of microplastics in the world’s oceans. They have also been found in freshwater ecosystems, in the soil, and even in the air. Even more worrying, they have been found inside a lot of animal species.