quick. what metro area has remained in the #1 slot in terms of metro area population for two hundred years, from 1810 to 2010? for bonus points, what metro area has seen the greatest decline over the past two hundred years? [ via stellar.io ]

the united nations predicts the world population to pass 7 billion on October 31 ( and heading toward 10 billion or more by the end of the century ). i guess it’s time to update the ol google population projection which is currently sitting at 6.7B on 2009 data. and the excellent national geographic 7 billion special series which captures the implications as only they can.