Malthus Had World Population Predictions Mathematically Backwards
In commemoration of World Population Day (July 11),
we reflect on recent discourse in demography suggesting
hidden economic burdens from lower birth rate trends,
and the role of morality in shaping fertility choices.
Malthus Misleads
Why Evidence Increasingly Shows that
Fewer Births Create Greater Burdens
by Dr. Sarah Buckland-Reynolds
For many of us, the summer period is one spent with extended family, where we reflect on legacies and even reminisce on family albums. In many of our realities, these albums tell a story of family norms where households of 5 and more children were commonplace. Contrasting to the digital records of today, our subsequent generations will statistically more likely see our modern families with 1-2 children than the large family traditions of the 1950’s era.
Beyond the dynamics of our own family units, the world commemorates World Population Day on July 11. Since 1989, the United Nations Development Programme has spearheaded conversations and events surrounding population growth. For the 2026 observance, the themes encompass conversations on “sustainable population management, reproductive health awareness, and equal access to resources and opportunities.”
In the context of a rapidly declining global population, and the Darwinian and Malthusian philosophies underpinning ‘reproductive health’ campaigns toward restricted population growth, this is a pertinent opportunity to reflect on whether the expected outcomes have played out in real life 228 years after Thomas Malthus published his famed work advocating for ‘population checks’ (mechanisms to reduce population growth to parallel resource growth rates).
State of the Global Population 2026
As of 2026, the world’s population has reached approximately 8.1 billion people, but growth is slowing dramatically compared to the mid-20th century, when global fertility averaged nearly five children per woman. Today, the mean fertility rate is just above 2.2 children per woman, hovering precariously close to the replacement threshold of 2.1. This marks a profound demographic shift: what was once feared as runaway growth has now given way to concerns about contraction.
More than half of all countries (99 out of 194) are already below replacement fertility, and together they account for nearly two-thirds of the world’s population. This means that without immigration, population decline is mathematically inevitable in most regions.
But, while these numbers speak, the 2026 theme for World Population Day still advocates for ‘sustainable population management’ and ‘reproductive health’. This phrasing carries significant policy weight as for decades, “sustainable population management” and “reproductive health” have been interpreted through the lens of limiting fertility. Specifically, in global policy guidance instruments since the 1994 International Conference on Population and Development (ICPD), “reproductive health” has been defined broadly to include access to modern contraceptives and even abortion, where declining birth rates was framed as “progress” (e.g., Section 1.8). This raises moral and cultural questions, especially when contrasted with perspectives that see children as blessings and family life as central to social renewal.
In view of these competing worldviews framed in demographic language, a Christian reflection on these issues therefore demands us to expose the underlying philosophies that have formed a contrast in demographic priorities guided by Scripture versus those guided by Malthusian philosophies. A scientific reflection also necessitates an exploration of any available rigorous evidence of outcomes from the practice of either worldview.
Did Malthus Get His Prediction Correct?
As was described in other articles and earlier in this piece, Thomas Malthus has been one of the most influential figures in demographic discourse and policy, following his publication of An Essay on the Principle of Population in 1798. He posited that population growth rates would always exceed resources, since the former was believed to grow exponentially (e.g., 1, 2, 4, 8, 16, 32), while the latter (resources) would only grow incrementally (1,2,3,4,5…). Malthus’ pessimistic worldview influenced evolutionary theory, with Darwin himself acknowledging Malthus’s impact on his thinking about natural selection. Both Malthus and Darwin failed to consider the role of human ingenuity in resource management, including via technological breakthroughs such as the Green Revolution, and instead, advocated for population ‘checks’ which would decrease the population.
Just around a month before World Population Day, on June 7, 2026, Demographics Professor of Economics from the University of Maryland joined EconoFact to discuss a publication by the Aspen Institute (Economic Strategy Group titled: Demographic Headwinds: The Economic Consequences of Lower Birth Rates and Longer Lives (Aspen Institute: Melissa S. Kearney and Luke Pardue (Eds.)), (24 February 2026). The work expounds upon multiple challenges of population decline from environmental, economic, and social perspectives.
Counteracting one of the arguments growing in popularity, contributing author, Kevin Kuruc explored the topic of the environment, and argued that “the Environmental Benefits of Low Fertility and Population Decline Are Overstated.” From his research, Kurac dismantles the common assumption that fewer people will ease climate burdens, justifying his logic based on the time-based requirements of tackling climate issues versus the timespan in which demographic change unfolds over generations. In his words, Kurac concedes that:
“It is too late for declining fertility to make a large difference in population size this century, and by the end of this century, it will be too late for population changes to make a large difference to eventual warming” (Kuruc, p. 7)
“On net, there appears to be little environmental justification for preferring a smaller population” (p. 12).
He further notes that:
“Our collective ability to find and deploy solutions is increased when there are more people, not fewer” (p. 13).
“Any realistic decline in near-term births would have a trivial impact on mid-century emissions” (p. 14)
Kurac also argued that smaller economies face higher per-capita costs for fixed investments like carbon capture. Therefore, without a growing population, policies geared at reducing pollution are shared among fewer people, adding to the existing burdens. In his words, Kuruc warns:
“Solving and adapting to our biggest environmental challenges requires human effort and resolve. A shrinking population may have less of each” (p. 18)
He also conceded that in the context of modern economies, the arguments about resource constraints as a justification for reducing population pressure on the environment are increasingly insignificant. In estimating this in statistical terms, Kurac showed that empirical data reveals that only 2.5–7.5% of global income flows to natural resource owners, and in the United States, less than 1%. This means that increasing per-person resource availability through depopulation barely affects living standards. Kuruc estimates that a 1% decline in global population would raise per-person incomes by only 0.05%; a gain which could be easily eroded based on fewer persons to share increased resource burdens from ageing populations and other consequences.
In a subsequent chapter in the Aspen collection titled: The labor market is also reshaped by aging populations, contributing authors Nicola Bianchi and Matteo Paradisi highlight a social consequence of Malthusian logic: higher old-age dependency ratios, with lower youthful populations to care for the elderly. With a negative trend of shrinking youthful population and a simultaneous positive trend of longer life expectancy, there is not only the added burden of old age dependents, but also the possibility of delayed economic stability for youthful populations who may have to compete with the elderly for jobs. This cycle feeds itself as delayed financial stability often further delays family formation for the next generations.
Other co-authors, Lisa Dettling and Luke Pardue explored fiscal sustainability, the impact of federal budget strain from social security and Medicare, and the resulting deficits and debt. At the local level, another contributing author, Jeffrey Clemens explored how declining school enrollments raise per-student costs, making it far harder to scale down services than to expand them. The tangible impacts of these are felt in the communities with shrinking populations facing complex decisions about closing schools, funding pensions, and maintaining infrastructure with fewer taxpayers.
The environmental, economic, and social costs of population decline from these real-life examples overturn long-standing assumptions rooted in Malthusian thought. Instead of the predicted famine and collapse from population growth outpacing resources, reducing populations also reduces the available resource base to sustain itself.
Beyond the Environmental, Economic and Social fruits:
Exploring the Moral Roots of Population Decline from The Secondary Demographic Transition
While the Aspen’s publication showed unmistakable evidence that Malthusian philosophy has failed to produce its intended outcomes, we also argue that the theory’s basis itself rests on faulty foundations as to the driving forces for fertility decisions. While Malthus emphasized materialistic and economic (resource)-driven incentives for population growth and checks, there is increasing evidence that fertility decisions are not simply products of one’s resources. The study of the trajectory of several European and Asian countries gave rise to a new, but less popular theory to highlight the often-neglected role of values in shaping fertility trends. Exploring the drivers of fertility decisions is important, as it can inform practical ways to discourage adverse drivers and incentivize good drivers of the trends we see.
In 1986, Lesthaeghe proposed the idea of the Secondary Demographic Transition (SDT), and continued the discourse on observations on the changes in marriage and divorce rates, cohabitation, and age of first motherhood as core drivers of population change, rather than as primarily an economic decision. In this way, we can understand population change as being more dominantly the result of shifting values, culture, and morality. The SDT posits that when societies prioritize individual autonomy over communal responsibility, fertility declines. It also follows that abandoning the Biblical formula for families also results in this decline.
Back to the Biblical Standard of Family Life
As we reflect on World Population Day, evidence shows that advocacy efforts informed from an evolutionary lens are self-defeating. History had already refuted Malthus through the Industrial Revolution, the Green Revolution, and modern technological advances, showing instead the value of human innovation for growth.
The Biblical vision of family life stands in stark contrast to the secular trends of population decline today. Despite the rhetoric aligning progressive population to declines, the Biblical formula is indeed responsible stewardship as the only way to keep population truly sustainable. Scripture affirms the dignity of children and the sanctity of family as a key to ensure dominion over the earth. As several Scriptures share the call, for example:
Psalm 127:3 declares:
“Children are a heritage from the Lord, offspring a reward from him.”
Proverbs 14:28 declares:
“A large population is a king’s glory, but without subjects a prince is ruined.”
Genesis 1:28 commands humanity to “be fruitful and multiply and fill the earth and subdue it.”
Fruitful family life being such a precious mandate from God should warrant Christians to counteract society’s secular turn. This World Population Day, how do we make a tangible difference to restore the Biblical mandate? Practical steps may include:
- Promote family as a moral calling: In your conversations, social media and other networks, emphasize that children are blessings, not burdens. Encourage communities to see family life as central to human flourishing.
- Strengthen institutions: If you are so blessed in resources, invest in healthcare, childcare, and education to build confidence in family formation.
- Foster intergenerational solidarity: Teach the value of supporting both the young and the old, countering the fragmentation of modern societies.
- Pastoral encouragement: Churches can provide spiritual and practical support for couples, reminding them of the Biblical vision of family.
The irony is that unfortunately, despite the evidence of the superiority of Biblical approaches to family life, secular rhetoric remains stubborn. Just as much scientific publications continue to be dedicated to evolutionary philosophy, demographic leaders have also maintained the Malthusian status quo, amidst evidence to its detrimental impacts. For us to truly have a sustainable population, we must take stock of the evidence and reverse the philosophies that have eroded the prioritization of family ideals. Let us return to the ancient paths where children were seen as a blessing rather than a burden. For us to truly progress, a Biblical orientation on population will be the key.
Dr. Sarah Buckland-Reynolds is a Christian, Jamaican, Environmental Science researcher, and journal associate editor. She holds the degree of Doctor of Philosophy in Geography from the University of the West Indies (UWI), Mona with high commendation, and a postgraduate specialization in Geomatics at the Universidad del Valle, Cali, Colombia. The quality of her research activity in Environmental Science has been recognized by various awards including the 2024 Editor’s Award from the American Meteorological Society for her reviewing service in the Weather, Climate and Society Journal, the 2023 L’Oreal/UNESCO Women in Science Caribbean Award, the 2023 ICETEX International Experts Exchange Award for study in Colombia. and with her PhD research in drought management also being shortlisted in the top 10 globally for the 2023 Allianz Climate Risk Award by Munich Re Insurance, Germany. Motivated by her faith in God and zeal to positively influence society, Dr. Buckland-Reynolds is also the founder and Principal Director of Chosen to G.L.O.W. Ministries, a Jamaican charitable organization which seeks to amplify the Christian voice in the public sphere and equip more youths to know how to defend their faith.