environment ministry is working to be designated a unesco world heritage site. it recently unveiled a plan to realize this goal. the amami islands boast a wide variety of animals and plants. they make their home in a mangrove forest on the biggest island. the ecosystem has marine life that doesn't exist anywhere else. nhk world has the story of one man who's dedicated his life to preserving the trees that have nurtured this ecosystem. >> reporter: he manages mangrove park but also works as a tour guide. >> translator: the trees get nutrients through their open roots. >> reporter: he was born and raised right near the forest. when he was a child. >> translator: i used to pass through here on my way home.