Doesn't it seem like the world is getting dumber with
every passing year? Well, maybe it is! Combining
published data for the mean IQ of countries with historical
and forecast population figures permits estimating the
mean IQ for the entire world's population. Standing at 91.6 in
1950, global mean IQ is presently around 89 and can be expected
to fall to about 86.3 by the year 2050. This document presents
the analysis, provides access to the source data for your own
investigation, and discusses the many uncertainties in any
study of this kind.