This article from the NY Post.com talks about some places where a lot of trash that dumps into the oceans comes from. But, as far as I know, we do not have an independent international body of representatives that will deal with these issues.

Here is that article. https://nypost.com/2017/12/12/10-rivers-are-responsible-for-90-of-the-plastic-in-the-ocean/

What I am beginning to personally notice is a serious lack of effort to force reform. There are short moments of media blitz regarding the subject, but no actual reform. No laws to stop the issue in its tracks.