Planet Reef

One of the seven wonders of the natural world, The Great Barrier Reef is home to some of the most magnificent marine life on Earth. But the GBR—and all reefs on Earth—are in critical condition, suffering from the ravages of global heating. Some people believe that there is little hope for them, but a dogged, courageous crew of marine scientists are surprising everyone with some ingenious, hands-on solutions, showing the world what imagination, science and action can achieve. (Viasat)