If we and the rest of the back-boned animals were to disappear overnight, the rest of the world would get on pretty well. But if the invertebrates were to disappear, the world's ecosystems would collapse

I'd like to see the giant squid. Nobody has ever seen one. I could tell you people who have spent thousands and thousands of pounds trying to see giant squid. I mean, we know they exist because we have seen dead ones. But I have never seen a living one. Nor has anybody else.

We can now manipulate images to such an extrodinary extent that there's no lie you cannot tell.

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.

People must feel that the natural world is important and valuable and beautiful and wonderful and an amazement and a pleasure.

No, not a feminist. I'm a humanist. I'm neither one side nor the other.

I'm no longer sceptical. I no longer have any doubt at all. I think climate change is the major challenge facing the world.