Check out the HuffPost article with pictures from the National Geographic here
Everyone knows that the population growth is uneven and disproportionate. The real issue here is currently there is very little we could do about it. With the advances in health science, infant mortality will decrease and human life span will be longer.
Perhaps one way to address this issue is to evening out the population via. mass emigration. But that calls into many countries drastically softening up their immigration policies, while others might fear that their nations’ sovereignty will be jeopardized.