World Population Day 2015 would be celebrated all over the world by the people on 11th of July at Saturday. The theme of this year's World Population Day is Vulnerable Populations in Emergencies.
More Links:
http://www.kerenvis.nic.in/KidsCentre/WorldPopulationDay_1991.aspx
http://www.unfpa.org/swop
http://www.unfpa.org/events/world-population-day