When did the great metropolises of the world appear?

Many people are saying that the world is urbanizing faster, with more than half of the population living in metropolises and cities. However, do you know when these huge cities we know today around the world came about?

The origin of civilization as we know it is ancient, but growth has been well accelerated: a study by researchers at Yale University examined how historians have measured the size and density of cities - from the oldest clusters to today's megalopolises - and ended up discovering some very interesting things.

One of the cool things was that the group transcribed and organized information from old studies and created one of the most understandable formats of world urbanization, which began over 6, 000 years ago.

Using this data, Max Galka of Metrocosm has put together a video showing this evolution of cities in 3 minutes, spanning the period from 3700 BC to 2000 AD. It is possible to see the emergence of cities as points that indicate when first historical and archaeological records of population in that region.

It is worth pointing out that the dates do not necessarily correspond to the actual birth of the city - the newer the metropolis, the redder the dot becomes. Galka also included interesting information about the context of the emergence of the sites. It is amazing to see the boom in the creation of civilizations in recent centuries.

The official paper published by Yale's researchers explained the real meaning of this work. "Whether as a disaster response, disaster relief, assessing human impacts on nature or estimating vulnerable populations around the world, it is essential to know where people and cities are geographically distributed, " the report says.

"In addition, the ability to geolocate the size and location of human populations over time helps us understand the evolution of the characteristics of human species, especially their interactions with the environment."