So let's raise the tone of the debate. Too often at the moment we look like schoolchildren squabbling over a toy - our most precious toy, the Earth. And the danger is that as we pull in opposite directions in our global tug of war, the Earth will end up broken - or at least unable to sustain human life. That is the worst case scenario - or maybe, from the Earth's point of view, the best.

It's amazing how resourceful you can become when you're in the middle of the ocean and there's only one way to get to the other side.

I am a rolling stone, never in one place for very long.

Like riding a bike for the first time, sometimes you just have to go for it. If you keep looking forwards and maintain your momentum, it will probably go well. But if you start to doubt yourself and look back, you are more likely to suffer a major wobble followed by a crash.

So let's raise the tone of the debate. Too often at the moment we look like schoolchildren squabbling over a toy - our most precious toy, the Earth. And the danger is that as we pull in opposite directions in our global tug of war, the Earth will end up broken - or at least unable to sustain human life. That is the worst case scenario - or maybe, from the Earth's point of view, the best.

I have learned to acknowledge and appreciate the 98% that I have achieved instead of the 2% that I didn't.

Despite what I had acchieved, I don't for a moment think I am any braver or better than anyone else. This is how I attempt to explain what gives me the stregnth to do what I do; when that thunderbolt of an idea first hit me and inspired me to row across oceans, it filled me with a sense of purpose so strong that it overcame my fears. Even when boredom, frustration, fatigue or despair threatened to overwhelm me, it was that powerful sense of purpose that kept me going.