We don't know where the dark plastic is, and partially because of that, we don't know just how ad all this plastic might be. The most basic way to keep plastic out of the ocean would just make less of it. But i do see a lot of good uses for plastic in places you might not expect. There was an interesting paper that found that just because of the plastic that surrounds the cucumber in the supermarket, the amount to that's emitted are five times lower than without a shrink rap.