There are a lot of people in the world today, but there haven't always been. The global population was relatively small for millennia -- until a sudden surge of population growth in the past 200 years. We're now reaching 8 billion people, 10 times what the population was in the late 1700s, and 30 times what is was in the first century AD. How did we get here? What factors made it possible for the world to sustain such large numbers in modern times?
This video previously had the titles "Where did all these people come from?" and "The world used to be a lot emptier".
