http://www.worldometers.info/world-population/#growthrate
"The latest United Nations projections indicate that world population will nearly stabilize at just above 10 billion persons after 2062." [1]
Also recommended: The documentary "Population Boom" by Werner Boote [2][3]
[1] http://esa.un.org/unpd/wpp/Documentation/publications.htm
[2] http://www.imdb.com/title/tt3107706/?ref_=fn_al_tt_1
[3] (German) http://www.populationboom.at/