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

All our environmental problems become easier to solve with fewer people and harder - and ultimately impossible to solve - with ever more people.

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.

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

It's like saying that two and two equals four, but if you wish to believe it, it could also be five ... Evolution is not a theory; it is a fact, every bit as much as the historical fact that William the Conqueror landed in 1066.

We can now destroy or we can cherish-the choice is ours.

I think we're lucky to be living when we are, because things are going to get worse.