There is good evidence that last year's European heat wave was influenced by global warming. It resulted in 26,000 premature deaths and cost $13.5bn.

People divide into groups where they talk to each other, but don't talk across the divide. And yet most of the challenges we face in the world today are challenges that are to do with trade, with technology, with how you make sure that people are properly educated, reform your health care system.

What I don't know is whether there is a way politically that you can beat away these, some of these populist movements because in the end I don't think they really do provide answers. They ride the anger. But they don't really have the answers. Or whether this is an experiment we're just going to have to go through first.

Obviously it is right that the Afghans take responsibility for their own future in the end, but they need to know and feel that we are there as partners for them if they are prepared to make the necessary changes. But we should be in no doubt as to why we are in Afghanistan. We ended up there because terrorism hatched there erupted thousands of miles away in New York on Sept. 11.

Ever so often in the history of human endeavour, there comes a breakthrough that takes humankind across a frontier into a new era. ... today's announcement is such a breakthrough, a breakthrough that opens the way for massive advancement in the treatment of cancer and hereditary diseases. And that is only the beginning.

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 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.