Scientists say they are up against the clock to save the Great Barrier Reef

Australia's Great Barrier Reef, one of the seven wonders of the natural world, is under threat. Rising ocean temperatures can cause coral bleaching when the coral turns white, making it vulnerable and stressed. Researchers in Australia and Hawaii have been conducting experiments to breed super corals that can withstand global warming. They have devised an 'assisted evolution' plan to help save the Great Barrier Reef.