Video: Human population by the billions

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January 6, 2015

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.

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January 6, 2015

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Deborah Byrd

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Deborah Byrd (asteroid 3505 Byrd) helps edit EarthSky.org and is a frequent host of EarthSky videos. Deborah created the EarthSky radio series in 1991 and founded EarthSky.org in 1994. Prior to that, she had worked for the University of Texas McDonald Observatory since 1976, and created and produced their Star Date radio series. She has won a galaxy of awards from the broadcasting and science communities, including having an asteroid named in her honor in 1990, a Public Service Award from the National Science Board in 2003, and the Education Prize from the American Astronomical Society in 2020. A science communicator and educator since 1976, Byrd believes in science as a force for good in the world and a vital tool for the 21st century. "Being an EarthSky editor is like hosting a big global party for cool nature-lovers," she says.