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

We need to save the Arctic not because of the polar bears, and not because it is the most beautiful place in the world, but because our very survival depends upon it.

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.

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

The blues is also existential and offers a sense of mature reflection that enabled it to be the leitmotif of modern life.

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.

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.