> https://www.science.org/doi/10.1126/sciadv.aaz5803 https://www.science.org/doi/10.1126/sciadv.aaz5803 I don't see a comment in that article about the origin

> https://www.science.org/doi/10.1126/sciadv.aaz5803 https://www.science.org/doi/10.1126/sciadv.aaz5803 I don't see a comment in that article about the original provenance of the waste in rivers - can you paste it?