Of all the creatures in the world that really frighten me - the hyena in Africa, the great white shark - leopard seals are near the top of the list. They're killers. If my team spots one, they'll pull me out of the water.

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.

The importance of music extends well beyond its performance.

Climate change is the Everest of all problems, the thorniest challenge facing humankind.

The right to have our environment protected for the benefit of present and future generations is our most important human right.

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

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.