Portugal - The Sado Miracle | ARTE.tv Documentary

Fisherwomen and environmentalists along Portugal's Sado river turn a once-polluted estuary back into a working oyster habitat, one restoration project at a time. It is a rare on-the-ground look at how patient, unglamorous conservation work actually pays off.

Why it's free: Free on ARTE.tv Documentary's own YouTube channel; ARTE produced and broadcasts it as a public broadcaster.