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

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'm preparing for a swim, I imagine absolutely everything about it: the color of the water, how cold it is, the taste of salt in my mouth. I visualize each and every stroke.

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

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

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.

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