Since I began exploring the ocean in the 1950s, 90 percent of the big fish have been stripped away. Tuna, sharks, swordfish, cod, halibut, you name it, the numbers have just collapsed. Also, about half of the coral reefs are gone, globally, from where they were just a few decades ago.

I've spent thousands of hours under water. And even in the deepest dive I have ever made, 2.5 miles (about 4 kilometers) down, I saw trash and other tangible evidence of our presence.

Use your power to do whatever it takes to secure for humankind an enduring place on this little blue speck in the universe - our only hope.

You should ask where your food is coming from.

Rather than be afraid of evolution and try to stifle inquiry, people should revel in the joys of knowing and find a serenity and a joy in being a part the rest of life on Earth. Not apart from it, but a part of it.

Fish from all over the world, from deep in the sea, wind up in countries from Germany to Japan. That is just crazy.

The ocean is dying, and we have no place to escape to if this experiment doesn't go in our favor.