a revised IAB/IESG document

>       ... To understand how big that number is,
>      one has to compare 178 billion to 10 billion, which is the
>      projected population on earth in year 2050 (see
>      http://www.popin.org/pop1998/).
>


A nit with the draft:  the URL is no longer good.  My sense from a quick
look at the site is that the UN is now SELLING these reports!

FWIW, the report at http://www.undp.org/popin/wdtrends/urbanization.pdf
shows a population of 7.15 billion in 2015, and 8.11 billion in 2030.  An
alternative would be to cite the original study as a document rather than a
URL.