I have started a few forums to collect ideas and to focus on the removal (and conversion) of the gigantic amount of garbage floating in the oceans – not only the material floating on the surface, but also in the depths and later (with some development and progress) on the seabed.
… the most relevant “activity” is in the German forum – https://reprap.org/forum/list.php?426
(and in another “closed community” forum in Germany too)
I’ve translated it into English to get a more “global” feedback, but there wasn’t this much resonance yet … have to wait, until it gets more momentum …