The really valuable thing about documenting coral bleaching is that it is this straight, very direct visual indicator of how hot the oceans are getting. If the temperature of the water passes a certain threshold, the corals turn white. It's that simple. There's nothing natural about the cycle that's going on right now. In 2016, we lost 29 percent of the Great Barrier Reef. So 29 percent of the Great Barrier Reef died in a single year, because the water was hot.

I feel a responsibility to get the truth out into the world.

Working in the Arctic is definitely colder, but not necessarily harder. There were different challenges. And in many ways, Chasing Coral was even more of a struggle for me personally. And more of a struggle to capture. Glaciers right now are changing very consistently. The interesting thing that we realized with Chasing Coral was that the corals reefs. They can go from living to dead in two months. And if you're not there at the right time to capture that before and after, you just show up and it's a dead reef. So it was a challenge to be at the right place at the right time.

The really valuable thing about documenting coral bleaching is that it is this straight, very direct visual indicator of how hot the oceans are getting. If the temperature of the water passes a certain threshold, the corals turn white. It's that simple. There's nothing natural about the cycle that's going on right now. In 2016, we lost 29 percent of the Great Barrier Reef. So 29 percent of the Great Barrier Reef died in a single year, because the water was hot.

We can and must use our combined skills at every opportunity available to address climate change.

The consequences of man-made climate change are real and very significant.

There's a huge challenge around coral bleaching specifically, because when most people think about coral, they think about the beautiful, white sculpture sitting on their mantle. And it looks so pristine and clean and beautiful. It's not supposed to look like that when it's in the ocean. It has color, it has animal flesh living on it, it has plants living inside of that. They look very, very different when they're healthy in the ocean than they do when they're sitting in somebody's home.