It's one of the most diverse marine ecosystems in the world.<br />But there's growing concern about the future of the Great Barrier Reef, off the northeast coast of Australia.<br /><br />The UN has warned that nearby port developments could see it listed as an endangered site.<br /><br />Al Jazeera's Yaara Bou Melhem joined the crew of a Greenpeace ship, trying to spread the word.
