Walker Swamp: The mission to restore an Australian wetland

In the shadow of Australia’s Grampians National Park lies Walker Swamp, a once-thriving wetland that was artificially drained and farmed for over a century.

But it is now welcoming new life once more, after a huge restoration project.

Its revival is one “message of hope” amid so much grim environmental news, ecologists tell the BBC.

Video by Isabelle Rodd