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

When you stand at the bottom of the mountain and look up at the mountaintop, the path looks hard and stony, and the top is obscured by clouds. But when you reach the top and you look down, you realize that there are a thousand paths that could have brought you to that place.

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

I have learned to accept that, in the present moment at least, things are exactly as they are meant to be, and although I cannot control the future any more than I could control the wind and the weather, I can manage it and influence it in a positive way.

Compared with the awesome might and eternal power of the ocean, no human being can fail to be reminded of their own insignificance.

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.

A few years ago I wrote two versions of my obituary, the one I wanted and the one I was heading for. They were very different. I realized I needed to make some big changes if I was going to look back and be proud of my life. I am making those changes, and now I have a life worth living.