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.

I'm swanning round the world looking at the most fabulously interesting things. Such good fortune.

One in eight plant species face extinction.

Until humanity manages to sort itself out and get a co-ordinated view about the planet, it's going to get worse and worse.

I have no doubt that the fundamental problem the planet faces is the enormous increase in the human population

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

I would love to see a giant squid. Very few people have seen them. And only about half a dozen people have seen one alive.