7 billion

We've reached a milestone for the world's population. What about the next three billion? Jack Goldstone considers the resources needed to manage ten billion people:

In the next century, the fastest population growth will take place in the world’s least advanced economies and some of its worst-governed countries. A global effort to improve governance and education in those countries, allowing the world to benefit from the human potential of billions of additional people, could again usher in a new stage of global prosperity. But failure to meet this challenge may consign billions of people to live in countries with failing states, brimming with angry and frustrated youth, prone to high levels of violence, and recurrent humanitarian disasters on ever-larger scales.