Earth human population has now exceeded 7 billion. How long did it take for the world to add each billion? What improvements in health and science helped population growth? And how long do demographers think it will take to reach 8 billion, and 9 billion? This video from the Population Reference Bureau, best source we know for population data and insights, helps you visualize the answers.
Video: Human population by the billions
When did our human population reach one billion? How long to add each billion after that, to bring us to the 7+ billion humans on Earth today? What’s next?