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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.
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We are not overpopulated in an absolute sense; we've got the technology for 10 billion, probably 15 billion people, to live on this planet and live good lives. What we haven't done is developed our technology.
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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.
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I would be absolutely astounded if population growth and industrialisation and all the stuff we are pumping into the atmosphere hadn't changed the climatic balance. Of course it has. There is no valid argument for denial.
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I think a major element of jetlag is psychological. Nobody ever tells me what time it is at home.
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The question is, are we happy to suppose that our grandchildren may never be able to see an elephant except in a picture book?
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The more you go on, the less you need people standing between you and the animal and the camera waving their arms about.
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Apart from anything else, I am designed by evolution, like we all are: if we see a little thing like that, big eyes, tiny nose, we go 'aaah'. That's what evolution does. We are programmed to do that. So to find babies the most amazing, isn't surprising, I don't think.
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Warm-bloodedness is one of the key factors that have enabled mammals to conquer the Earth, and to develop the most complex bodies in the animal kingdom. In this series, we will travel the world to discover just how varied and how astonishing mammals are.
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I think we're lucky to be living when we are, because things are going to get worse.
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Getting to places like Bangkok or Singapore was a hell of a sweat. But when you got there it was the back of beyond. It was just a series of small tin sheds.
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London has fine museums, the British Library is one of the greatest library institutions in the world... It's got everything you want, really.
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Television of course actually started in Britain in 1936, and it was a monopoly, and there was only one broadcaster and it operated on a license which is not the same as a government grant.
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It's a moral question about whether we have the right to exterminate species.
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I believe the Abominable Snowman may be real. I think there may be something in that.
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I don't approve of sunbathing, and it's bad for you.
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I'm against this huge globalisation on the basis of economic advantage.
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I'm not an animal lover if that means you think things are nice if you can pat them, but I am intoxicated by animals.
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I've been to Nepal, but I'd like to go to Tibet. It must be a wonderful place to go. I don't think there's anything there, but it would be a nice place to visit.
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I don't run a car, have never run a car. I could say that this is because I have this extremely tender environmentalist conscience, but the fact is I hate driving.