It's coming home to roost over the next 50 years or so. It's not just climate change; it's sheer space, places to grow food for this enormous horde. Either we limit our population growth or the natural world will do it for us, and the natural world is doing it for us right now.

If you watch animals objectively for any length of time, you're driven to the conclusion that their main aim in life is to pass on their genes to the next generation.

Do we really require so many gardening programmes, makeover programmes or celebrity chefs?

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

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

You know, it is a terrible thing to appear on television, because people think that you actually know what you're talking about.

People are not going to care about animal conservation unless they think that animals are worthwhile.