Bummer: After 18 million years, tiny amounts of natural, invisible gas may cause Great Barrier Reef to disappear really, super-duper soon

World's oceans move into 'extinction phase' - Telegraph

The next generation may lose the opportunity to swim over coral reefs or eat certain species of fish, scientists have warned, as the world's oceans move into a 'phase of extinction' due to human impacts such as over-fishing and climate change.

Great Barrier Reef, North Queensland, Australia

The Great Barrier Reef is around 18 million years of age in the north and 2 million Years old in the south, with the existing reef system being between 10,000 and 6000 years old.