I mean, it is an extraordinary thing that a large proportion of your country and my country, of the citizens, never see a wild creature from dawn 'til dusk, unless it's a pigeon, which isn't really wild, which might come and settle near them.

How could I look my grandchildren in the eye and say I knew what was happening to the world and did nothing.

All life is related. And it enables us to construct with confidence the complex tree that represents the history of life

I don't approve of sunbathing, and it's bad for you.

I suppose happiness is something one enjoys, but I suspect that happiness is not a state but rather a transition.

I often get letters, quite frequently, from people who say how they like the programmes a lot, but I never give credit to the almighty power that created nature.

I am an ardent recycler. I would like to think that it works. I don't know whether it does or not.