World Population Day 2025 Theme Upsc. The list of national and international days includes important national observances such as republic day (january 26), independence day (august 15), and gandhi jayanti. Established by the united nations in 1989, it commemorates the “day of five billion” when the world’s population surpassed five billion.
By the united nations (un) in 1989. Dramatic growth in the world’s population has.