“How are the numbers calculated?
World population data are extrapolated from statistics obtained from the United Nations Population Division. The clock indicates an increase of about three people a second by tracking both births and deaths.

Data on productive land are extrapolated from statistics produced by the United Nations Food and Agriculture Organization. The clock shows that one hectare is lost every 7.67 seconds. Productive land is made up of arable land, pasture land, and forest.

World Population
From now until the middle of the 21st century, in only fifty years, the world’s population will increase by 50% from 6 billion at the end of 1999 to close to 9 billion in 2050. ”

I can remember when I was born in the early 70’s, the world had less than 4 billion. I’m all for growth of the human race, but is it really smart growth?