6/19/2023 0 Comments World population graph since 0 adReceived: FebruAccepted: Published: May 20, 2021Ĭopyright: © 2021 Christopher Bystroff. PLoS ONE 16(5):Įditor: Eda Ustaoglu, Gebze Teknik Universitesi, TURKEY Numbers for the 2020 global census were not available for this study.Ĭitation: Bystroff C (2021) Footprints to singularity: A global population model explains late 20th century slow-down and predicts peak within ten years. Population projections depend strongly on the unknown fragility or robustness of the Earth’s essential ecosystem services that affect agricultural production. Simulations suggest that population may soon peak or may have already peaked. A system dynamics model that best fits recent population numbers suggests that the global biocapacity may already have been reduced to one-half of its historical value and global carrying capacity may be at its 1965 level and falling. The discrepancies between the projected growth and the actual population data since 1970 are accounted for by a decrease in the global carrying capacity due to ecosystem degradation. Population data for the second millennium up to the year 1970 was fit to a hyper-exponential growth equation, where the rate constant for growth itself grows exponentially due to growth of life-saving technology. Expressing humanity as a K-selected species whose numbers are limited by the global carrying capacity produces a different outlook. Projections of future global human population are traditionally made using birth/death trend extrapolations, but these methods ignore limits.
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