🇦🇺Australia

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

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.

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