I now know, the horseshoe crab and thousands of other ancient, resilient creatures may not survive the impact my species has had on the living world, largely in a single century. More worrisome, humankind may not survive for long, either, unless we use our remarkable capacity to learn from the past, anticipate the consequences, and take actions that will ensure an enduring future. As it turns out, the future of the ocean, the creatures who live there, and our own future are inextricably linked.

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Sometimes I try a poetic approach and describe how luminous, rainbow-colored jellies, starlike planktonic creatures, giant squid, translucent pink prawns, gray dolphins, brown lizards, spotted giraffes, emerald mosses, rustling grasses, every leaf on every tree and all people everywhere, even residents of inland cities and deserts who may never see the sea, are nonetheless dependent upon it.

Part of human impact on the earth relates to our swiftly growing numbers. If we do not take deliberate, conscious action to maintain a reasonable balance between the numbers of people and the environmental wealth required to sustain us, nature will make appropriate adjustments, and famine, disease, and wars-the predictable outcomes of living beyond one's environmental means, of overspending environmental capital-will ultimately force a cruel discipline.

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(What is the biggest threat to the ocean right now?) Deep-sea mining. Some are buying into the lie that we should be taking minerals that are necessary for today’s generation of [EV] batteries, like lithium, cobalt and nickel, from the deep sea, because who cares what happens in the deep sea? These deep-sea systems are full of life and are part of the biogeochemical cycling systems that hold Earth steady. If Earth functions like a big computer system with all these little wires and lights that we don’t understand but we know it keeps us alive, would we want to get in there and take those little lights out because we don’t understand how they work?

Just as we have the power to harm the ocean, we have the power to put in place policies and modify our own behavior in ways that would be an insurance policy for the future of the sea, for the creatures there, and for us, protecting special critical areas in the ocean.

This is a time of pivotal, magnified significance for humankind. The fabric of life and the physical and chemical nature of the planet have been significantly altered through decisions already made by our predecessors and those now living; what happens next depends on what we do, or do not do, individually and collectively, in the next few decades. Depending on choices we make, our species may be able to achieve a viable, sustainable future, or we may continue to so alter the nature of the planet that our kind will perish.

As I walked solemnly over the blackened, blistered remains of what had been a friend's home, it was clear that those with whom I share the present time matter most: family, friends, acquaintances, members of my species throughout the world, and ranging beyond humankind, to other creatures I know personally or have met and admired on their own terms, from great humpback whales who turned their eyes to meet mine to the three Stellar's jays that recently fledged from a nest over my backdoor. I wish them well, want them to prosper, will take measures to protect them, if I can...

People ask: Why should I care about the ocean? Because the ocean is the cornerstone of earth's life support system, it shapes climate and weather. It holds most of life on earth. 97% of earth's water is there. It's the blue heart of the planet — we should take care of our heart. It's what makes life possible for us. We still have a really good chance to make things better than they are. They won't get better unless we take the action and inspire others to do the same thing. No one is without power. Everybody has the capacity to do something.

No one can say for sure what such disruptions may mean for human well-being or survival; clearly, however, a global experiment is in progress, and we are in the middle of it, as a part of, not apart from, the rest of life on Earth. Unlike most other participants, though, we have the ability to alter the course of events, and we shall, either through conscious decisions aimed at making a difference, or by default, through inaction or ignorance.

that’s the joy of being a scientist and an explorer. You do what little children do. You ask questions, like: Who? What? Why? When? Where? How? And you never stop, and you never cease being surprised. You just never stop that sense of wonder. It is fantastic that life exists at all. And I revel in just the joy of being out in some wild place, or even in my own backyard. Just look at a leaf. It’s an amazing thing what goes on in a leaf; and it happens all the time, and we can breathe because of it, or because of photosynthesis that takes place there and in the sea. Knowing that, I think it’s just impossible to be bored.