This is CBS I In The World. I'm John Bachelor. I welcome

Katrina Brayhick, the Environment Editor of the Economist magazine, to help me with a special

section in the Economist magazine about biodiversity, the scale of biodiversity. And I go immediately

to an example of what we don't know and what we need to know and what we're learning

about the creatures around us and the forest that we live in on Planet Earth. The cicadas

of the United Kingdom are at this moment not present. The 17-year cicadas just appeared

again in America in New Jersey. They're very special because you can hear them easily.

I learned that the cicadas of the United Kingdom, when and if they return, can only be heard

by children, how can we listen to something that is that difficult, that challenging

to our ears? That's part of the new science of biodiversity. Katrina, very good evening

to you. Okay. They're back. We think, but we can't hear them. Only children can. How

can we hear them? Good evening, too. Good evening, John. And thank you for having

me. Yes, this is a species known as the New Forest cicada. And as you say, what's remarkable

about them is I think we're all used to thinking of that sort of very distinctive, regular

chirp of the cicada. For me, actually, the company is all of my memories of a child, as

a child, because my family is from the south of France. So I spent all of my summers in

Povolson. Of course, there's that constant sound of cicadas in the background. It's

always there to the point that you forget it's there. And the new forest cicada is actually

it makes a hissing sound, which remarkably is not within the hearing range of adults

of most humans. So children who have a different bandwidth can hear it. But adults cannot.

And I used this species in my reporting as an example of the kinds of things that new

technologies are allowing us to study the kinds of species and parts of ecosystems that

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