The world population between 1820 and now changed so dramatically, those datapoints are virtually meaningless. Not to mention, they indicate either 1/2 or 1/4

The world population between 1820 and now changed so dramatically, those datapoints are virtually meaningless. Not to mention, they indicate either 1/2 or 1/4 (depending on who's counting) lived with less than $2 per day. Not exactly something to celebrate.