The days of exploration of Shackleton and Scott are long gone. Everything has been climbed, crossed, done. Now what we're exploring are the full boundaries of human endeavour. It's not physical - it's all in the head.

When I was born, the world's population was 3.5 billion. There are now 6.8 billion people on the planet. By 2050, that's expected to rise to 9.4 billion. What's more, the Earth's resources aren't growing; they're decreasing - and rapidly.

We need to save the Arctic not because of the polar bears, and not because it is the most beautiful place in the world, but because our very survival depends upon it.

Normally I don't race other people; I challenge the environment and my own limitations.

I find the parallels between how some investors refuse to recognise the trends and our reaction to some of our environmental challenges very powerful. There is an unwillingness to process unpleasant data.

I talk to fashion designers and say I want some money to save the rainforest, and they say, 'Oh, I agree with you completely Vivienne. Yes, climate change, it's definitely happening,' but they don't feel that they can do anything about it; they don't even think 'Well let's stop it!'

I founded NextGen Climate with a clear mission in mind: to act politically to prevent climate disaster and preserve American prosperity.

The trouble with climate change is it's an extraordinarily diverse and complex issue, but for example if the BBC would let me make some of the programmes I'd like to make on climate change, I bet you there would be a change of emphasis.