That people will object very much to seeing a predator killing its prey, and yet, in the news, will accept showing shots of people shooting one another.

Fundamentally not to waste energy. If we were all to reduce our demands for energy, it would make an enormous amount of difference.

Nature isn't positive in that way. It doesn't aim itself at you. It's not being unkind to you.

I just wish the world was twice as big and half of it was still unexplored.

There are some four million different kinds of animals and plants in the world. Four million different solutions to the problems of staying alive.

One in eight plant species face extinction.

You've got to be fairly solemn [about the environment]. I mean the mere notion that there are three times as many people on Earth as there were when I started making television. How can the Earth accommodate them? When people, including politicians, set their faces against looking at the consequences-it's just unbelievable that anyone could ignore it.