Sharks are beautiful animals, and if you're lucky enough to see lots of them, that means that you're in a healthy ocean. You should be afraid if you are in the ocean and don't see sharks.

It has taken these many hundreds of millions of years to fine-tune the Earth to a point where it is suitable for the likes of us.

We have the capacity to alter the nature of nature. No, we don't have just the capacity - we are altering the nature of nature, the natural systems that cause the planet to function in our favor.

If you think the ocean isn't important, imagine Earth without it. Mars comes to mind. No ocean, no life support system.

We're still under the weight of this impression that the ocean is too big to fail, that the planet is too big to fail.

All through college, I had frequently been the only girl in a science class - which wasn't such a bad deal.

We have become frighteningly effective at altering nature.