I still remember the day in school when our teacher told us that the world population had become three billion people, and that was in 1960. And I'm going to talk now about how world population has changed from that year and into the future, but I will not use digital technology, as I've done during my first five TED Talks. Instead, I have progressed, and I am, today, launching a brand new analogue teaching technology that I picked up from IKEA: this box. This box contains one billion people. And our teacher told us that the industrialized world, 1960, had one billion people. In the developing world, she said, they had two billion people. And they lived away then. There was a big gap between the one billion in the industrialized world and the two billion in the developing world. In the industrialized world, people were healthy, educated, rich, and they had small families. And their aspiration was to buy a car. And in 1960, all Swedes were saving to try to buy a Volvo like this. This was the economic level at which Sweden was. But in contrast to this, in the developing world, far away, the aspiration of the average family there was to have food for the day. They were saving to be able to buy a pair of shoes.