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.

[W]hen we look at the graphs of rising ocean temperatures, rising carbon dioxide in the atmosphere and so on, we know that they are climbing far more steeply than can be accounted for by the natural oscillation of the weather ... What people (must) do is to change their behavior and their attitudes ... If we do care about our grandchildren then we have to do something, and we have to demand that our governments do something.

In the old days... it was a basic, cardinal fact that producers didn't have opinions. When I was producing natural history programmes, I didn't use them as vehicles for my own opinion. They were factual programmes.

We can now destroy or we can cherish-the choice is ours.

London has fine museums, the British Library is one of the greatest library institutions in the world... It's got everything you want, really.

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.

Well, I'm having a good time. Which makes me feel guilty too. How very English.