I've always said, 'Underwater or on top, men and women are compatible.'

When I write a scientific treatise, I might reach 100 people. When the 'National Geographic' covers a project, it communicates about plants and fish and underwater technology to more than 10 million people.

Our past, our present, and whatever remains of our future, absolutely depend on what we do now.

We are blessed with a place that is open to the universe and, despite this, supports this very thin envelope of air we call atmosphere, which holds just the right amount of oxygen for us to breathe.

Great attention gets paid to rainforests because of the diversity of life there. Diversity in the oceans is even greater.

We still have the illusion that the ocean will recover. That even if we do have to lose sharks, people don't understand why this matters. The evidence is in front of us, and we fail to take it in and say, "Now I get it. Now I understand."

You should ask where your food is coming from.