There's a graph from the paper (and the name of the paper) here that shows how much ocean plastic is from rivers; it's a lot but not 90% https://www.scientificamerican.com/article/stemming-the-plas...
There's a graph from the paper (and the name of the paper) here that shows how much ocean plastic is from rivers; it's a lot but not 90% https://www.scientificamerican.com/article/stemming-the-plas...