So the UN said 9 billion by 2050, now this site is saying 12 billion.<quoted text>Wrong again
How fast is the world's population growing?
The world's current growth rate is about 1.3%, representing a doubling time of 54 years. We can expect the world's population of approximately 6 billion to become 12 billion by 2054 if the current rate of growth continues. The world's growth rate peaked in the 1960s at 2% and a doubling time of 35 years.
For more information, visit my World Population and Population Geography categories of resources.
Quite a difference, maybe you need to check the sources???