This much is certain: We have the power to damage the sea, but no sure way to heal the harm.

It's taken us a short time to change the nature of nature. In my lifetime, more change than during all preceding human history put together.

America gains most when individuals have great freedom to pursue personal goals without undue government interference.

I hope that someday we will find evidence that there is intelligent life among humans on this planet.

The diversity of life on Earth, generally, is astonishing. But despite those large numbers, it's also important to recognize that every species, one way or another, is vulnerable to extinction. And in our time on Earth... our impact on the diversity of life has been profound.

We have been far too aggressive about extracting ocean wildlife, not appreciating that there are limits and even points of no return.

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.