There are some four million different kinds of animals and plants in the world. Four million different solutions to the problems of staying alive.

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 fundamental issue is the moral issue.

This last chapter .. may have given the impression that somehow man is the ultimate triumph of evolution, that all these millions of years of development have had no purpose other than to put him on earth. There is no scientific evidence whatever to support such a view and no reason to suppose that our stay here will be any more permanent than that of the dinosaur.

Nothing in the natural world makes sense - except when seen in the light of evolution

If my grandchildren were to look at me and say, 'You were aware species were disappearing and you did nothing, you said nothing', that I think is culpable. I don't know how much more they expect me to be doing, I'd better ask them.

You'll find people where their conditions aren't changing in any way, its rather rare for them to be happy.