Don't worry, there's no shortage of ways to prevent getting to 16 or 32 billion people. First among those is that very few countries have birth rates that exce

Don't worry, there's no shortage of ways to prevent getting to 16 or 32 billion people. First among those is that very few countries have birth rates that exceed replacement rates! And the others are on a very strong trend to follow over the next 10-20 years.