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

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 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.

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.

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

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

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