Far and away the greatest threat to the sea and to the future of mankind is ignorance. But with knowing comes caring, and with caring, the hope that maybe we'll find the Holy Grail of understanding, strike a balance with the natural systems that sustain us, and thus achieve an enduring place for humankind on a planet that got along without us for billions of years and no doubt could do so again.

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A few individuals, armed with modern technology, can wield enormous destructive power. One person with a bulldozer can, in a few days, eliminate a forest that has been quietly building for millennia; one fisherman deploying miles of drift nets can wipe out entire seagoing societies...But just as individuals can and do negatively impact the course tory, so can and do individuals make a positive difference.

We have an opportunity, now, to achieve for humankind a prosperous, enduring future. If we fail, through inability to resolve thorny issues, or by default born of indifference, greed, or lack of knowledge, our kind might well be a passing short-term phenomenon, a mere three or four million-year blip in the ancient and ongoing saga of life on Earth.

If I were an evil alien wishing to alter the nature of life on earth, I would change the temperature of the ocean, I would change the chemistry. That is exactly what we are doing: excess carbon dioxide in the atmosphere becomes excess carbon dioxide in the ocean that becomes carbonic acid. The ocean is becoming more acidic. That changes everything.

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.

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To ensure a decent quality of life for the rest of our lives, as well as for all those who follow, we must develop global policies that recognize the interdependence of life and the need for nations to agree on mutually beneficial measures to protect and maintain the basic elements of life support, on a planetary scale. But it is difficult to be concerned

Being a child in Florida when my parents moved there in 1948 and witnessing the changes in the coastline, the marshes that I first discovered - finding horseshoe crab eggs, these tiny little creatures prospering in really clear water and going out on a dock at night and seeing these bioluminescent creatures just flashing and glowing - and witnessing the change, that the waters became not beautiful, clear and blue but muddy - that was powerful incentive to say, why are we doing this?

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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.

I've had a chance to live underwater 10 times now in various underwater laboratories and to use more than 30 different kinds of submarines, thousands of hours seeing the ocean from the inside out and realizing this is not just rocks and water; this is alive. It's a soup, like minestrone, but all the little pieces are alive.

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on balance, if I had to choose the most interesting and important time in all of human history to live, it would be now. As never before, and perhaps as never again, the choices made in the near future will determine mankind's success, or lack of it. These are the "good old days" sure to be envied by those in the future.

(What is the single most important thing we can do for the oceans today?) Right now a disproportionate bite out of the ocean is being taken by a relatively small number of countries doing industrial fishing. We’ve got to get over this idea that wildlife from the ocean is essential for our food security. What we now are beginning to understand is the high cost of eating fish. What does it take to make a pound of tuna? A lot of halibut or cod. What makes the halibut? Smaller fish. What do they eat? Krill. Krill eat phytoplankton, zooplankton. Over the years thousands of pounds of phytoplankton make a single pound of tuna. So that tuna is expensive in terms of the carbon that it has captured. The more fish we take out of the sea, the more carbon dioxide gets released into the atmosphere.