https://www.sciencemag.org/news/2014/06/can-plastics-cause-i...
https://environmentjournal.online/articles/microplastic-poll...
https://www.theguardian.com/us-news/2019/may/24/toxic-americ...
None of this is conclusive, but there's more and more evidence that microplastics might be causing serious reproductive issues in humans.