> Our experience with asbestos, another fibre that can penetrate cells, suggests "very bad" is on the list of potentials. On the other hand, the issue seems to

> Our experience with asbestos, another fibre that can penetrate cells, suggests "very bad" is on the list of potentials. On the other hand, the issue seems to be animals ingest microplastics, mistaking them for food. The thing is, the vast majority of any environment is "not food". Tiny sand particles, dust, lignin, volcanic ash. If there is one thing life is phenomenally good at, it's distinguishing "not food" from food. Introducing a poison like pesticides into the environment, or wholesale environmental change like CO2 is doing - that could and indeed is wiping out a lot of species. But I have a hard time believing another source of "not food" will cause the same scale of damage.