[cdrini]

Those percentages surprised me, so I did some research and it looks like the stat from their research is that 80% of the Great Pacific Garbage Patch is fishing industry plastics. Not all ocean plastic, which is what the 8-10mil refer to. Ref: https://theoceancleanup.com/ocean-plastic/#other-sources-of-... . Plastics from rivers gets caught in currents that bring it near ocean coastlines/beaches, and takes a long while to make it out to free sea/GPGP. These plastics are mostly non-fishing related. (note: this link is actually a great write-up of why their mission is what it is, and their research backing it).

There are NGOs working on legislation/lobbying fixes to the problem; eg Ocean Conservancy. But those changes will take a looooong time to get through the system. And regardless, there's already plastic in the oceans that will have to be cleaned up regardless, causing damage right now. So starting on the cleanup at the same time seems reasonable to me.

The ocean cleanup also funds various research initiatives -- like the numbers you mentioned -- which lobbyists can use to help change legislation.