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This is the French Visture Debating Society. I'm John Bachelor. It is springtime coming in Australia.

Therefore, enjoy the outdoors, especially the wildlife, especially the marsupials, especially

the koala. Koala's live in eucalyptus trees and therein lies a revelation.

What's underway right now is a revelation to me and everyone in North America

that the eucalyptus tree is, let's put it this way. There's a weakness for the eucalyptus tree.

And Jeremy's here to explain it to us. It should have been obvious to me the reporting I've done

on koalas. Koalas enjoy living in eucalyptus trees. They spend most of their life there,

not on the ground in the tree. Why? Because they eat eucalyptus leaves. Why? Because over the 25 to

35 million years they've adapted, there have been many environments in Australia. They are

marsupials. They're not at all predictable. However, one of the environments that became

commonplace last tens of thousands of years was eucalyptus trees, which spread in parts of the

Australian continent very easily. And there's a weakness. Jeremy, a very good day to you. What is

the weakness of the eucalyptus tree that here in North America and in Europe and in South America

and in fact around the world we should worry about? Good evening to you.

You know, John, yes, the eucalyptus tree is a mighty tree. It stands tall. It is strong,

and it is enormous. And it's one of those beasts of the wild, wild areas that you just can't

help but stand back in the mud. But it does have one weakness as you asked it. The eucalyptus tree

...