Global population to reach 3 in 2050 , CNN projects . Most growth is occurring in developing and poor nations , study finds . ` The increase from 6 billion to 7 billion is likely to take 12 years , as did the increase from 5 billion to 6 billion . India 's population expected to almost triple by two years . India projected to overtake China as most populous country .
Global population to reach 3 in 2050 , CNN projects . Most growth is occurring in developing and poor nations , study finds . India 's population expected to almost triple by two years . India projected to overtake China as most populous country .