That does represent a change of attitude. Going back, again, a few decades, the only good fish to catch was a big one. (Soundbite of laughter) Right. Dr. EARLE: Unless you were catching a lot of little ones. But now there is this new understanding that the big ones are the best ones to keep alive. They should be protected. I mean, so should the little ones. So should all of them, actually. (Soundbite of laughter) Thanks very much for the call, Pat. Let's go next to - this is Forrest(ph), And Forrest with us from Golden, Colorado. Yes, sir. Thank you very much. One of the most avoided, evaded and simply ignored issues and if not suppressed in this whole discussion is the fact that the human race adds 80 million people every single year, about a billion every 13 years now. And I've traveled all over the world. I've been scuba diving since I was 14, back in 1963. And I've been in all the oceans.

I've watched the progression of destruction. And I would hope that all those solutions really come down to - we need to discuss stabilizing the human race as to its sheer numbers, because no matter how much we try to avoid what's - what we're seeing, if we don't change course on human population growth and move toward human stabilization of their numbers, our numbers, then all of our discussions are simply going to be a waste of time. So I would hope that NPR would, at some point, begin a population discussion. And I would love to be a part of it, because I've seen the ramifications and the consequences of it all over the planet for the last 45 years. Oh, well, thank you for that. It's an issue that we continue to report on and discuss. As you know, demographers have brought down the size of the increase of the global population because of changing economics largely, in many parts of the world, including China and other places where this is changing.

But this is a vital subject, and we pledge to report on it and keep reporting on it. And thank you very much for the suggestion. We'd also like to thank you. You got the last word. Our guests here at the National Geographic Society, Sylvia Earle, National Geographic explorer-in-residence, and Enric Sala, marine ecologist and National Geographic fellow. Can we get a round of applause for them, please? (Soundbite of applause) We'd also like to thank the staff here at the National Geographic for all their hard work and hospitality today, and to the audience who joined us here at the Grosvenor Auditorium.

Before we leave, we also need to thank Drew Reynolds, who's leaving NPR after many years, after the end of next week. He spent the last few as technical director on this program. No one ever took more care to think through the strange ideas and unlikely locations we wanted to try on this program. Drew regularly went above and beyond to Edison bulb us sound as good as possible and did it all with unfailing good humor and rock-solid professionalism. We wish him well and tell him we're going to miss him.