I suppose happiness is something one enjoys, but I suspect that happiness is not a state but rather a transition.

In the West, that's what's happening. The birth rate has been dropping steadily and still is. But there is still a vast amount of the world where that's not the case. And that is where the big population growth is taking place.

It's a moral question about whether we have the right to exterminate species.

Getting to places like Bangkok or Singapore was a hell of a sweat. But when you got there it was the back of beyond. It was just a series of small tin sheds.

If I can make programmes when I'm 95, that would be fine. But I would think I'll have had enough by then.

I'm luckier than my grandfather, who didn't move more than five miles from the village in which he was born.

The savage, rocky shores of Christmas Island, 200 miles south of Java, in the Indian Ocean. It's November, the moon is in its third quarter, and the sun is just setting. In a few hours from now, on this very shore, a thousand million lives will be launched.