7.3 billion people, one building

Abstract

The global population of approximately 7.3 billion individuals occupies a remarkably small physical volume when aggregated at high densities. Arranged in a single-file line, the human species would extend 9.8 million kilometers, completing roughly 56 circuits around the Earth’s equator. In two-dimensional space, assuming a packing density of 10 persons per square meter, the entire living population could be contained within a 729-square-kilometer area, a footprint smaller than the land area of New York City. This spatial efficiency extends even to the estimated 108 billion humans who have ever lived, who could collectively fit within the borders of Jamaica. In three dimensions, utilizing an average height of 1.65 meters and a volume of 0.165 cubic meters per person, the current population fits inside a cubic structure with sides of 1.07 kilometers. This volume of 1.2 cubic kilometers is only 29% taller than the world’s tallest skyscraper. At the most fundamental level, the removal of empty atomic space—which constitutes nearly all human volume—would compress the total mass of the species into approximately 0.485 cubic centimeters. This results in a mass of 450 million tonnes concentrated into a volume smaller than a single sugar-coated chocolate candy. Such measurements illustrate the significant disparity between the perceived numerical scale of humanity and its actual physical presence within the biosphere. – AI-generated abstract.