“The main purpose of World Population Day is to get us all to think about how we can accommodate our planet’s growing population.” (Bing.com) The first World Population day was July 11, 1987 when it was estimated that 5 billion people inhabited earth. Today that number is 7.4 billion.
World population chart, from 1800 to 2100 — showing both estimates and actual population counts. World population estimates from 1800 to 2100, based on: United Nations projections (in 2010) — “high” (colored red), “medium” (orange), and “low” (green) U.S. Census Bureau (historical estimates) — (colored black). Actual recorded population figures (colored blue). According to the highest estimate, the world population may rise to 16 billion by 2100; according to the lowest estimate, it may decline to 6 billion. From: Wikipedia, world population.