You may have missed it but:
A major demographic shift took place on Wednesday, May 23, 2007: For
the first time in human history, the earth’s population is more urban
than rural. According to scientists from North Carolina State
University and the University of Georgia, on that day, a predicted
global urban population of 3,303,992,253 exceeded that of
3,303,866,404 rural people. In the US, the tipping point from a
majority rural to a majority urban population came early in the late
1910s. (Hat tip: Robert Wuebker).
