We also know the source of the plastic in the ocean... turns out it boils down to a very small number of rivers, in a very specific region of the world. https://www.weforum.org/agenda/2018/06/90-of-plastic-polluti...
The East isn't any different.
Perhaps when it gets too full of local trash, some of it gets moved to the ocean?
I've heard they say you tax things you don't want to see? why not tax pollution at the source, the rivers?