You know, it is a terrible thing to appear on television, because people think that you actually know what you're talking about.

The climate, the economic situation, rising birth rates; none of these things give me a lot of hope or reason to be optimistic.

The human population can no longer be allowed to grow in the same old uncontrollable way. If we do not take charge of our population size, then nature will do it for us and it is the poor people of the world who will suffer most

People are not going to care about animal conservation unless they think that animals are worthwhile.

The most extraordinary thing about trying to piece together the missing links in the evolutionary story is that when you do find a missing link and put it in the story, you suddenly need all these other missing links to connect to the new discovery. The gaps and questions actually increase - it's extraordinary.

Many individuals are doing what they can. But real success can only come if there is a change in our societies and in our economics and in our politics.

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.