Humanity is facing a very big, slow, long, drawn-out threat, and that is to do with the way the weather is changing and the size of the population.

The more you go on, the less you need people standing between you and the animal and the camera waving their arms about.

The truth is: the natural world is changing. And we are totally dependent on that world. It provides our food, water and air. It is the most precious thing we have and we need to defend it.

The process of making natural history films is to try to prevent the animal knowing you are there, so you get glimpses of a non-human world, and that is a transporting thing.

The nature of human beings is that they'd far rather face the disaster that is happening tonight than the one that is happening tomorrow.

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

The question is, are we happy to suppose that our grandchildren may never be able to see an elephant except in a picture book?