The importance of music extends well beyond its performance.

I learned two basic lessons on Everest. First, just because something has worked in the past does not mean it will work today. Second, different challenges require different mindsets.

Going against the tide has never been difficult for me. It wasn't even a conscious decision but the natural consequence of following my own instinct.

There is nothing more powerful than the made-up mind.

If you want to swim across the English Channel from England to France - you have to leave your doubt on the beach in England.

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.

If we pass on an unsustainable environment to our children we have failed them.