Invent a way this river mouth stops feeding the ocean

If you can say it in one plain sentence — Most ocean plastic arrives through rivers — catch it there, and clean the big floating patches separately. — you understand the week.

Then invent a way a river-mouth coast can stop feeding the ocean with trash. Leave the design open.

Do not invent a required brand machine. Do not treat one nonprofit product as the only answer. Do not invent a whole-ocean vacuum that ignores rivers and shore waste paths.

Try it at https://warmersun.com/forge/?q=spotlight-earth-driftmouth-rivers-first-2026. Free signup. No card.