The Great Barrier Reef, battered but not broken by climate change impacts, is inspiring hope and worry alike as researchers race to understand how it can survive a warming world. Authorities are trying to buy the reef time by combining ancient knowledge with new technology. They are studying coral reproduction in hopes to accelerate regrowth and adapt it to handle hotter and rougher seas.

Underwater heat waves and cyclones driven in part by runaway greenhouse gas emissions have devastated some of the 3,000 coral reefs making up the Great Barrier Reef. Pollution fouls its waters, and outbreaks of crown of thorns starfish have ravaged its corals.

Researchers say climate change is already challenging the vibrant marine superstructure and all that depend upon it—and that more destruction is to come.

"This is a clear climate change signal. It's going to happen again and again," said Anne Hoggett, director of the Lizard Island Research Station, on the continuing damage to the reef from stronger storms and marine heat waves. "It's going to be a rollercoaster."

Billions of microscopic animals called polyps have built this breathtaking 1,400-mile long colossus that is visible from space and perhaps a million years old. It is home to thousands of known plant and animal species and boasts a $6.4 billion annual tourism industry.