Most estimates place Earth’s human population at around 8.2 billion, but Josias Láng-Ritter—a postdoctoral researcher at Aalto University in Finland and lead author of the study published in the ...

LEILA FADEL, HOST: There are now 8 billion people living on planet Earth. It's a milestone that came pretty quickly. The world added 7 billion people in just over 200 years.

Even more staggering is that of the 7 billion people on Earth, about 1.4 billion of them will be old enough to have observed the arrivals of the 6 billionth, 5 billionth, 4 billionth and 3 ...