You have to steer a course between not appalling people, but at the same time not misleading them.

The fundamental issue is the moral issue.

We keep putting on programmes about famine in Ethiopia; that’s what’s happening. Too many people there. They can’t support themselves — and it’s not an inhuman thing to say. It’s the case. Until humanity manages to sort itself out and get a coordinated view about the planet it’s going to get worse and worse.

It was regarded as a responsibility of the BBC to provide programs which have a broad spectrum of interest, and if there was a hole in that spectrum, then the BBC would fill it.

Being in touch with the natural world is crucial.

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

Crying wolf is a real danger.