Climate change will affect the whole of humanity, while terrorist attacks will only affect a small section of humanity. Of course, you wouldn't say that if you were related to someone who had been beheaded or blown up or murdered. But 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.

I think a major element of jetlag is psychological. Nobody ever tells me what time it is at home.

Do we really require so many gardening programmes, makeover programmes or celebrity chefs?

Instead of controlling the environment for the benefit of the population, perhaps we should control the population to ensure the survival of our environment

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

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.

I remember when we were in the World Cup in Australia and I had to win the singles against Tony Payne, best of seven legs, to win it. I was 2-0 down but ended up beating him I suffer much less than many of my colleagues. I am perfectly able to go to Australia and film within three hours of arrival.