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Updated: Apr 21, 2026

Predicting the Effectiveness of Population Replacement Strategy Using Mathematical Modeling

Predicting the Effectiveness of Population Replacement Strategy Using Mathematical Modeling

Published on: July 4, 2007

Human population reduction is not a quick fix for environmental problems.

Corey J A Bradshaw¹, Barry W Brook²

¹The Environment Institute and School of Earth and Environmental Sciences, The University of Adelaide, Adelaide, SA 5005, Australia corey.bradshaw@adelaide.edu.au.

Proceedings of the National Academy of Sciences of the United States of America

|October 29, 2014

Summary

This summary is machine-generated.

Global human population growth strains Earth's resources. Even rapid fertility reductions or mass mortality events show limited impact by 2100, highlighting the need for sustainable consumption.

Keywords:

catastrophe demography fertility mortality war

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Area of Science:

Environmental Science
Demography
Ecology

Background:

Global human population growth is a significant driver of environmental degradation.
Increasingly, fertility reduction is proposed as a solution to environmental challenges.

Purpose of the Study:

To model the potential impact of fertility reduction scenarios on global population size by 2100.
To assess the long-term effects of demographic momentum on ecosystems.

Main Methods:

Scenario-based matrix modeling was employed to project population trends.
Analysis considered current mortality trends and hypothetical fertility policies, including a one-child policy and mass mortality events.

Main Results:

Even a rapid global one-child policy would result in a population size similar to today's by 2100.
A catastrophic mortality event of 2 billion deaths would still leave approximately 8.5 billion people by 2100.
Without drastic fertility reduction, Africa and South Asia face the most significant human pressures on biodiversity hotspots.

Conclusions:

Humanity's demographic momentum limits the immediate impact of policy interventions on population size.
Substantial population reduction will take centuries; immediate sustainability gains require addressing resource consumption.
Reversing rising natural resource consumption through policies and technologies offers more immediate benefits for environmental sustainability.