Before the BBC, I joined the Navy in order to travel.

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.

Since when has Finland been a rotten place to live in?

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

I suffer much less than many of my colleagues. I am perfectly able to go to Australia and film within three hours of arrival.

The fact is that no species has ever had such wholesale control over everything on earth, living or dead, as we now have. That lays upon us, whether we like it or not, an awesome responsibility. In our hands now lies not only our own future, but that of all other living creatures with whom we share the earth.

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