The best philanthropy is not just about giving money but giving leadership. The best philanthropists bring the gifts that made them successful-the drive, the determination, the refusal to accept that something can't be done if it needs to be into their philanthropy.

If what the science tells us about climate change is correct, then unabated it will result in catastrophic consequences for our world.

People always think American politics is very different, but usually it is a predictor of what happens in the politics elsewhere.

The best philanthropy is not just about giving money but giving leadership. The best philanthropists bring the gifts that made them successful-the drive, the determination, the refusal to accept that something can't be done if it needs to be into their philanthropy.

But I am an optimist about Britain; and the difference between an optimist and a pessimist is not that the optimist believes the world is wonderful and the pessimist believes it's beset by challenges; the difference is the pessimist believes we will be defeated by them; the optimist thinks the challenges can be overcome.

You choose your own reality and you - social media then amplifies those conspiracy theories. So that's why I say social media is itself a revolutionary phenomenon.

The first big choice: a government with the strength to deliver stability, or a government that takes the country back to boom and bust.