Plastic rides rivers into the ocean

Plastic does not teleport into the middle of the ocean. A large share of the floating trash that can still be caught as big pieces travels first through rivers and city waterways, then along coasts, and only later into open-ocean patches.

In a river, trash is still bunched in a channel. Flow and banks make a choke point. Out at sea, pieces spread, break into tiny bits, and get harder to scoop.

So the teachable chain is simple: land leak → river ride → ocean entry → hard-to-catch patch. Catching earlier in that chain is why river machines exist. Cleaning a big floating patch is a different job for trash that already escaped.

This lesson is about floating trash you can still guide and lift — not every tiny plastic speck already mixed through the water.