If I can bicycle, I bicycle.

We are a plague on the Earth.

Crying wolf is a real danger.

The fundamental issue is the moral issue.

One in eight plant species face extinction.

Natural history is not about producing fables.

Being in touch with the natural world is crucial.

It never really occurred to me to believe in God.

There are perfectly good independent small nations.

I'm a humanist. I'm neither one side nor the other.

I don't approve of sunbathing, and it's bad for you.

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

Since when has Finland been a rotten place to live in?

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

I'm not over-fond of animals. I am merely astounded by them.

Can a growing human population still leave space for wildlife?

I suspect that happiness is not a state but rather a transition.

I'm against this huge globalisation on the basis of economic advantage.

No, not a feminist. I'm a humanist. I'm neither one side nor the other.

I just wish the world was twice as big and half of it was still unexplored.

If we [humans] disappeared overnight, the world would probably be better off.

It's a moral question about whether we have the right to exterminate species.

Well, I'm having a good time. Which makes me feel guilty too. How very English.

Now, I find that very difficult to reconcile with notions about a merciful God.

I think the most alarming animals I have encountered are really poisonous snakes.

Trade is a proper and decent relationship, with dignity and respect on both sides.

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

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

I believe the Abominable Snowman may be real. I think there may be something in that.

What humans do over the next 50 years will determine the fate of all life on the planet.

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

It is curiosity, quite right-a divine curiosity. A characteristic of the gods is curiosity.

Nature isn't positive in that way. It doesn't aim itself at you. It's not being unkind to you.

We can now manipulate images to such an extrodinary extent that there's no lie you cannot tell.

If we were all to reduce our demands for energy, it would make an enormous amount of difference.

All the modern devices we have enable us to investigate things and have enabled us to do better.

I think a major element of jetlag is psychological. Nobody ever tells me what time it is at home.

I'm swanning round the world looking at the most fabulously interesting things. Such good fortune.

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

I am an ardent recycler. I would like to think that it works. I don't know whether it does or not.

Anyone who believes in indefinite growth on a physically finite planet is either mad or an economist

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

In the Baboon community, it is not how strong you are that is important, but who you know that counts

If I can make programmes when I'm 95, that would be fine. But I would think I'll have had enough by then.

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

No one will protect what they don't care about, and no one will care about what they have never experienced.

How could I look my grandchildren in the eye and say I knew what was happening to the world and did nothing.

The World is full of wonders, but they become more Wonderful, not less Wonderful when Science looks at them.

I'm luckier than my grandfather, who didn't move more than five miles from the village in which he was born.

It is that range of biodiversity that we must care for - the whole thing - rather than just one or two stars.

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