From tentacular megalopolises to the most remote hamlets, the world population has been distributed over time according to complex dynamics, often poorly understood. Long considered reliable, current demographic models are struggling to reflect this reality. A recent study reveals that millions of individuals living in rural areas still escape radars in large international databases. Behind the official figures of the world's population hides a disturbing gap between estimate and real presence on the ground.
The problem comes in particular from the methods used to map the population. Some models are based on the detection of night lights from satellite images, a major bias in regions where access to electricity is limited. Others incorporate national censuses, themselves sometimes incomplete, especially in developing countries. The researchers compared this data to the precise rehousing figures linked to the construction of 307 dams in 35 countries. These projects require a detailed assessment of displaced populations, thus offering a reliable point of comparison.
Josias Láng-Tritter, principal researcher of the study, stresses that the extent of this underestimation is particularly worrying. According to Iflscience, the errors noted in the databases of 2010 persist in those of 2015 and 2020, which means that the current calculations of the total number of inhabitants on earth are probably wrong.
The world's population is much more numerous than you think
If 43% of the world's population officially lives in rural areas, this figure is largely undervalued. Taking into account the populations omitted by the databases could increase the total far beyond the 8.2 billion currently identified. This gap poses a real problem for regional planning, infrastructure management and access to essential services.
By relying on unsuitable models, governments and international organizations make decisions based on partial figures. Nature reveals the direct consequences of this underestimation: the authorities neglect entire regions in the planning of roads, hospitals and water supply systems. This error also biaises plans for response to natural disasters, such as earthquakes or floods, and exposes these populations more at risk.
Some experts remain cautious about these conclusions. Stuart Gietel-Basten, demographer at the University of Sciences and Technology in Hong Kong, believes that the study of Aalto University is focused too much on Asia and China. He doubts that these errors also affect countries like Australia or Sweden, which have advanced recording systems. However, most researchers agree that current methods require a deep reassessment.
Towards more precise tools to map the population
To remedy these shortcomings, scientists call for a modernization of census techniques. The integration of new data sources, such as high -resolution satellite images and more frequent field readings, could improve the accuracy of estimates. Some initiatives are starting to explore alternative approaches, in particular the use of anonymized mobile statements and independent databases.
The stake is major. Without a correct estimate of the world's population, access to essential services could remain unequal, perpetuating development inequalities. As Láng-Critter points out, the decisions taken today in terms of infrastructure and public health are based on erroneous demographic maps. An update of census models would ensure a better distribution of resources and more effectively anticipate the challenges to come.
The study of Aalto University sheds light on these errors, but it also raises a crucial question: how many inhabitants are still not counted? As long as this uncertainty persists, the official figures of the world population remain an approximation, far removed from reality.
With an unwavering passion for local news, Christopher leads our editorial team with integrity and dedication. With over 20 years’ experience, he is the backbone of Wouldsayso, ensuring that we stay true to our mission to inform.
