The world's demographers this week increased their estimates of the world's population through the coming century. We are now on track to hit 10 billion people by 2100. Today, humanity produces enough food to feed everyone but, because of the way we distribute it, there are still a billion hungry. One doesn't need to be a frothing Malthusian to worry about how we'll all get to eat tomorrow. Current predictions place most of the world's people in Asia, the highest levels of consumption in Europe and North America, and the highest population growth rates in Africa -- where the population could triple over the next 90 years. Perhaps those regions with unsustainable populations should be encouraged to stop making so many children?