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.

most of all, it matters that the world is blue because our lives depend on the living ocean-not just the rocks and water, but stable, resilient, diverse living systems that hold the world on a steady course favorable to humankind. The big question is, what can we do to take care of the blue world that takes care of us?

two things changed in the 20th century that may jolt us into a new way of thinking. First, more was discovered about the nature of the ocean and its relevance to the way the world works than during all preceding history. Second, during the same narrow slice of time, human actions caused more destruction to ocean systems than during all preceding history. And the pace is picking up.

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Even if you never have the chance to see or touch the ocean, the ocean touches you with every breath you take, every drop of water you drink, every bite you consume. Everyone, everywhere is inextricably connected to and utterly dependent upon the existence of the sea.

The ocean drives climate and weather, regulates temperature, absorbs much of the carbon dioxide from the atmosphere, holds 97 percent of Earth's water, and embraces 97 percent of the biosphere. Far and away the greatest abundance and diversity of life occurs in the ocean, occupying liquid space from the sunlit surface greatest depths.

Only here in this part of the universe, on Earth, is there known to be a place naturally blessed with abundant, liquid water. Not only is this the singular place with an ocean of salt water, but even more significant, it is an ocean that is filled with life that in turn, during some four billion years, has shaped the basic rocks and water of the planet into a strikingly different kind of place, a place unlike any known to exist anywhere else.

“Green" issues make headlines these days, but many seem unaware that without the "blue" there could be no green, no life on Earth and therefore none of the other things that humans value. Water-the blue-is the key to life. With it, anything is possible; without it, life does not exist.

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.

The ocean is large and resilient, but it is not too big to fail. What we are taking out of the sea, what we are putting into the sea are actions that are undermining the most important thing the ocean delivers to humankind – our very existence.

I hope Jill Tarter's wish to engage Earthlings includes dolphins and whales and other sea creatures in this quest to find intelligent life elsewhere in the universe. And I hope, Jill, that someday we will find evidence that there is intelligent life among humans on this planet. (Chuckles) Did I say that? I guess I did.