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… - Sylvia A. Earle

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.

Sometimes, I try to imagine what intelligent aliens, viewing Earth from afar, might think about the sea. From their perch in the sky, they could immediately see what many earthlings never seem to grasp: that this is a planet dominated by saltwater! In fact, the ocean is the cornerstone of the systems that sustain us: every breath we take is linked to the sea.

I feel like a witness to—I am—to the greatest era of change on the planet as a whole. Anybody who’s been around even for ten years is a part of this, but the longer you’ve been around, the more you’ve seen. And the last half-century, in particular, has been a time of revolutionary change. We didn’t know the existence of those great mountain chains, hydrothermal vents, the existence of life in the deepest sea, seven miles down. Nobody had been there. Not until 1960 was it possible for two men to make a descent to the deepest part of the sea.