The only way of really getting world population to stop is to continue to improve child survival to 90 per cent. That's why investments by Gates Foundation, UNICEF and aid organizations, together with national government in the poorest countries, are so good: because they are actually helping us to reach a sustainable population size of the world. We can stop at nine billion if we do the right things. Child survival is the new green. It's only by child survival that we will stop population growth. And will it happen? Well, I'm not an optimist, neither am I a pessimist. I'm a very serious 'possibilist'. It's a new category where we take emotion apart, and we just work analytically with the world. It can be done. We can have a much more just world. With green technology and with investments to alleviate poverty, and global governance, the world can become like this. And look at the position of the old West. Remember when this blue box was all alone, leading the world, living its own life. This will not happen. The role of the old West in the new world is to become the foundation of the modern world — nothing more, nothing less. But it's a very important role. Do it well and get used to it.