Far and away, the greatest threat to the ocean, and thus to ourselves, is ignorance. But we can do something about that.

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.

The image of Earth from space transformed our view of ourselves. It is maybe the most important image that exists - because we can see ourselves in context in a way that otherwise would be really hard to explain. It should inspire us to wonder about it, to want to know everything we can about it and do everything we can to take care of it.

The oceans deserve our respect and care, but you have to know something before you can care about it.

We are not only warming the ocean and the planet as a whole, but we are also acidifying the ocean and changing its chemistry.

Only two percent of the ocean is fully protected right now.

There is this sweet spot in time when we have an opportunity to stop killing sharks and tunas and swordfish and other wildlife in the sea before it's too late.