The rapid growth of the world's
human population in recent
history.
1998 Revision of the World Population Estimates and Projections From the UNFPA
World population reached:
- 1 billion in 1804,
- 2 billion in 1927 (123 years later)
- 3 billion in 1960 (33 years)
- 4 billion in 1974 (13 years)
- 5 billion in 1987 (12 years)
- 6 billion in 1999 (12 years)
- 7 billion in 2013 (14 years - projected)
- 8 billion in 2028 (15 years - projected)
- 10.7 (high) or 8.9 (middle) or 7.3 (low) billion projected for 2050
The world is adding about 78 million more people every year, the population of France, Greece and Sweden combined, or equivalent to a city the size of San Francisco every three days.