Following is a transcript of the video. Narrator: This is the Great Barrier Reef, and it's dying. Less than 20 years ago, the world's largest living structure looked like this, and this.

In 2016 and 2017, marine heat waves caused by climate change resulted in mass bleaching, which killed about half of the corals on the Great Barrier Reef, along with many others around the world.

For decades, the Great Barrier Reef has enjoyed World Heritage Status and been synonymous with diving, tourism and with Australia. But in June of this year, UNESCO threatened to downgrade the Great ...

For those who dream of exploring the Great Barrier Reef's underwater paradise, avoid crowds by visiting a lesser-known ...

One of the seven wonders of the natural world, the Great Barrier Reef lies in the clear blue waters off the northeast coast of Australia. Spanning 14 degrees of latitude, this complex reef system is ...

Australia's Great Barrier Reef is home to a tremendous array of endangered species, some found nowhere else in the world. Renowned for its beautiful corals and water clarity, the reef was listed by ...

In 2016 and 2017, marine heat waves caused by climate change resulted in mass bleaching, which killed about half of the corals on the Great Barrier Reef, along with many others around the world.