"How many people will inhabit the planet before population growth finally levels off? The figure most commonly used is 9 billion by 2050, up from 6.7 billion today — an extraordinary number, considering that there were only 1 billion humans in 1830. (Right now there are a billion people just between the ages of 10 and 19.) But there’s a growing debate about this projection and what it means."
[via Dot Earth]
STATS: Earth 2050: Population Unknowable?
