🇦🇺Australia

Scientists and volunteers are replanting Sydney's lost underwater crayweed forests, reef by reef.

Born from surfers picking up rubbish after every session, Take 3 turned a simple habit -- take three pieces of trash off the beach -- into a global plastic-pollution movement reaching millions.

Volunteer divers grow coral fragments on offshore nurseries near Cairns and replant them onto Great Barrier Reef sections damaged by bleaching and cyclones.