The Overpopulation Project
TOP – Research and Outreach
Too many people consuming too much
Tag: environment
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New paper defends a pragmatic definition of overpopulation
Distinguishing ecologically sustainable from excessive human populations is necessary to understand humanity’s environmental challenges and pursue our best options for addressing them. A new publication from TOP presents a definition of human overpopulation based on plausible scientific and ethical criteria, rather than wishful thinking. by Philip Cafaro Last year, TOP published a working paper presenting…
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Goodbye Paul Ehrlich
We remember a giant of the modern environmental movement, who passed away this past Friday at the age of ninety-three. by The Overpopulation Project Paul R. Ehrlich, an American biologist, died on 13 March. Ehrlich was one of the most influential environmental thinkers of the past half century. He built his early scientific reputation studying…
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Watershed Woes
Despite half a century of efforts to improve water quality and restore fisheries in America’s Chesapeake Bay, its ecological condition continues to decline. A new study quantifies the environmental problems within the Chesapeake Bay watershed, explores their causes, and discusses possible futures. by Philip Cafaro As the third largest estuary on Earth, the Chesapeake Bay…
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What Are Floors Without Ceilings?
Staying within safe planetary boundaries for global resource use and pollution makes good sense. Are there a complementary set of economic and social measures that could help human societies remain within ecological limits? by Erik Assadourian Not long ago a new update to the Planetary Doughnut was published in Nature, complete with 35 indicators to…
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Major UN report highlights overpopulation and overconsumption, need for profound transformation
A major new review of the state of the environment by the United Nations Environment Programme (UNEP) provides a comprehensive and refreshingly honest exploration of the root drivers of environmental degradation, and stresses the urgent need to overhaul how we live on this planet. by Olivia Nater, originally published by Population Connection The 7th edition…
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TOP end of year roundup
Thanks to our readers and supporters for an engaging and productive year. We look forward to hearing from you and sharing new work in the coming one. by The Overpopulation Project 2025 was Frank’s, Jane’s and Phil’s eighth year with The Overpopulation Project. Along with our ”truly TOP” research associate Pernilla Hansson, we continue to…
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The argument from failure
After seven years of research and blogging here at TOP, it’s sometimes hard to think of new things to say about population matters. But recent events suggest a new argument for overpopulation that readers may not have considered. By Philip Cafaro The top global environmental stories of the past month have been the failure of…
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Thank you for the Baklava
Through a story centered around the nurturing of an orphaned owl, author Carl Safina tackles topics such as biodiversity loss, human overpopulation, and human beliefs. Richard Grossman has read the book. by Richard Grossman MD “Alfie & Me” is a many-layered joy to read! Its main story is as delicious as they come. An orphaned…
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Farewell to Jane Goodall — Population Activist
Jane Goodall was a champion for chimpanzees, conservation, and population activism. The latter aspect of her work has been conspicuously neglected in recent tributes to this scientific giant. by Leon Kolankiewicz Pioneering English primatologist Dr. Jane Goodall (1934-2025) passed away last week at the age of 91. In the days since, numerous, well-deserved and glowing…
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Thirsty for Growth: How Arizona is Trading Water for Sprawl
Touted as a conservation success story, new legislation in Arizona is actually a ploy to resume unsustainable development in areas that are running out of water. It foolishly seeks to override hard physical limits with paper water credits, displacing wildlife and farmland in service to sprawl. by Phil Cafaro In June 2025, the Arizona Department…
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Growth Addiction and Water in the American Southwest
GrowthBusters is a terrific podcast dealing with the environmental costs of growth, hosted by Dave and Stephanie Gardner. On their latest episode, river activist Gary Wockner talks about the state of the Colorado River and the growth obsession that keeps cities and states in the southwestern U.S. from responding rationally to increasing water scarcity. by…
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The Planet Cannot Hold the Weight of 8.2 billion Narratives. Here’s Why…
As ecosystems deteriorate and wealth inequality deepens, the impact of overpopulation on the natural world is well-documented—but its effects on democracy, social cohesion, and psychological well-being remain largely unexplored. This essay examines how our bloated, hyper-complex societies have outgrown their ability to meet individual needs, leading to a breakdown in political and social structures. By…
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What’s up with America?
Some see a recent upsurge of fascism, or a unique malevolence in the current President. The reality is less dramatic: the continued erosion of American institutions, a long-term trend furthered by bankrupt ideologies. by Philip Cafaro A few months ago in this space, I wrote that Donald Trump’s obvious character flaws disqualified him as a…
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Overpopulation: A New Survey Confirms the Cause of the Planet’s Environmental Crises
Synthesizing findings from hundreds of recent peer-reviewed scientific studies, a comprehensive new article reviews the effects of expanding human populations on humanity’s most pressing environmental problems. by Alon Tal A vast amount of research and rhetoric is devoted to the world’s many sustainability challenges. Yet most advocates and scientists assiduously avoid acknowledging the predominant driver…
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Is Homo sapiens an invasive species?
The global spread and increase of the human species is exceptional and seems unmatched in the animal kingdom. Some researchers suggest we resemble so-called invasive species. Does the label fit? By Frank Götmark (This a translation of a Swedish essay published in Svenska Dagbladet on 30 March, slightly modified) Japanese oyster, raccoon dog, lupine –…
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A new definition of global overpopulation, explained and applied
Some environmentalists believe current environmental problems can be addressed successfully without reducing human numbers, while others disagree. Which side is right? Our new working paper tries to get to the bottom of the matter. by Philip Cafaro Recent years have brought a cascade of bad environmental news from around the world: melting glaciers and acidifying…
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America’s “Serengeti” at risk: Population-driven sprawl threatens the Greater Yellowstone Ecosystem
From the Everglades to the Arctic plains, population growth and associated development threaten America’s protected areas. A recent study from NumbersUSA, Greater Yellowstone: An Ecosystem at Risk, documents this for the United States’ flagship national park. By Leon Kolankiewicz and Rob Harding Rampant development and a surging human population are imperiling what has been dubbed…
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The Need For More Wilderness Preservation
In a picture essay with stunning photos from all around the United States, ecologist and author George Wuerthner highlights how valuable wilderness preservation is for both wildlife and human societies. by George Wuerthner Big W, or designated wilderness as prescribed under the 1964 Wilderness Act, is one of the most biocentric pieces of legislation ever…
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A genuine humanity
Do modern societies have a realistic path toward living in harmony with nature? How can population activists combine compassion and effective advocacy? We invite your answers to these difficult yet necessary questions. by Gaia Baracetti Sebastião Salgado is a Brazilian photographer. His striking black-and-white photographs, taken during his long, immersive travels to forgotten or war-ravaged…
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No sustainable paradigm is attainable without gradual population reduction
The Jus Semper Global Alliance is dedicated to building a better world based on democracy, sustainability and fairly sharing the world’s wealth. Its website gathers valuable material on a full range of issues regarding economic, social and ecological justice. As its founder and executive director reminds us here, “no matter how efficient and fair the…
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A primer on economic growth and biodiversity for COP16
Many readers will be familiar with the good work of CASSE: the Center for the Advancement of the Steady State Economy. Here its executive director reminds us of the need to end growth if we hope to preserve biodiversity, a recurring theme at TOP (see here, here and here). by Brian Czech With the core…
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Songs about population and the environment – what’s your favorite?
Music is a rich source of inspiration for those of us who want to end population growth and improve environmental conditions. TOP looks at some classic hits and new songs recently sent to us and asks for more. By The Overpopulation Project A few weeks ago, two readers contacted us regarding their own songs. Kelvin…
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Time to vote!
Immigration is proving to be a hot topic in the run up to EU parliamentary elections. While the focus has been on immigration’s cultural and social effects, changes in immigration policy could also impact future population numbers across Europe. This has consequences for citizens, the environment and ecosystems. by Philip Cafaro According to the European…
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Slow Down: The Degrowth Manifesto
Socialism or barbarism or … social democracy with a mature acceptance of limits to growth? That’s the question posed by Kohei Saito’s provocative new best-seller. by Philip Cafaro Let me admit right up front that I’m a little jealous. As a philosophy professor who’s written a few books but no best sellers (yet!), I can’t…
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Demography and reproductive rights are environmental issues: Insights from sub-Saharan Africa
Rapid population growth impacts many social, economic, and environmental issues, and sub-Saharan Africa is the fastest growing region in the world. Céline Delacroix and Nkechi S. Owoo asked stakeholders in the region how important they think population growth is as a factor in meeting the region’s challenges. By Céline Delacroix Sub-Saharan Africa’s population is growing…
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Biodiversity and the roles of human population and consumption: a debate
It is the rich minority’s consumption that mainly affects the status of the Earth’s life support system, according to a response in Svenska Dagbladet by David Collste at Stockholm Resilience Center and Jennifer Hinton at the University of Lund to an Op-ed by Malte Andersson and Frank Götmark. But will the poor majority consent to…
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Earth’s nature is being ravaged by population growth
Humanity’s rapid expansion leads to environmental destruction, starvation and ravaged biodiversity. Population growth needs to be ended as soon as possible for sustainability. By Malte Andersson and Frank Götmark Published 2024-01-02 in Svenska Dagbladet, morning newspaper in Sweden (translated by TOP) In 1800, the world’s population was 1 billion, but in 2022 we exceeded 8…
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Can nature-based tourism offer additional protection of wildlife in developing countries with strong population growth?
Recently, a TOP blog emphasized the importance of addressing luxurious overconsumption, including the hypocrisy of rich people wanting to be seen as environmentally friendly. Is nature-based tourism merely pandering to this hypocrisy, or can sites with nature-based tourism or ecotourism be beneficial for wildlife in developing countries with increasing populations? By Oskar Lindvall and the…
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The United Nations Population Fund Promotes Population Denial
Humanity heading for 9 billion and the UN’s chief population organization says forget about numbers. What’s going on? by Madeline Weld November 15, 2022. That’s the day the world population reached 8 billion, according to the UNFPA, the United Nations organization whose original raison d’être was to help end population growth. The UNFPA (reflecting its…
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Ecological Footprint and Sustainable Population
With humanity currently in overshoot, societal changes must be enacted to return to sustainable levels. While either a country’s ecological footprint or population size could be altered to achieve the necessary level, combined efforts on both fronts would be most effective. By Denis Garnier, president of Démographie Responsable A sustainable population corresponds to the total…
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How to Fix the Planet, the Easy Way
To avoid disastrous deterioration of Earth’s climate and biosphere, humanity has to reduce its demands on nature. Fewer births and a falling population is no quick fix, but compared with voluntary austerity, it has many more up-sides than down-sides. by Jon Austen Scientists are reporting that there is an existential threat to life on Earth.…
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How environmental professionals acknowledge overpopulation – and then ignore it
We can have an environmentalism that ignores the fundamental causes of environmental problems, including lucrative careers treating overshoot’s many symptoms. Just not a successful environmentalism. by Leon Kolankiewicz Veteran population campaigners like me have long lamented the fact that at both the national and international scales, the environmental establishment (Big Green) and climate activists alike…
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Strange bedfellows of sustainability: How identity politics obstructs the future of wilderness
Preserving wild places is key to protecting Earth’s biodiversity. In the United States and elsewhere, identity politics undermines the commitment to do so. by Karen Shragg Preserving wilderness is in the best interests of all of us, especially the four-legged and two-legged creatures with whom we share our countries. When people give other species room,…
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Procreation and Consumption in the Real World
The cause of global environmental decline is clear: an immense and rapidly growing human economy. In response, environmentalists should advocate policies leading to fewer people and lower per capita consumption, not one instead of the other. Addressing both provides our best hope of creating sustainable societies and preserving Earth’s remaining biodiversity. by Philip Cafaro There…
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Human population reduction is not a quick fix for environmental problems
Then again, neither is anything else. The long lag time between fertility reduction and population stabilization is a key reason we need to address excessive human numbers sooner rather than later. by Phil Cafaro There’s an argument one often hears that goes like this: “sure, population is important. But we need to reduce our environmental…
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Walk the talk: the world needs more Gretas and fewer Leonardos
People in rich countries must rein in their consumption, but the hypocrisy of high-profile environment advocates makes them poor role models, argues Gaia Baracetti. By Gaia Baracetti This is an overpopulation blog, but its authors have made it clear that overconsumption is a problem too, and that the two are, as it is often said,…
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Big Australia needs rethink on World Population Day 2023
Another UN World Population Day passed with the UN focussing on anything but population growth. Australia’s population is growing faster than most, with sustainability not on the government’s radar, as Stephen Williams laments. By Stephen Williams I don’t pay much attention to awareness days, but I make an exception for World Population Day, first observed…
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Population’s effects on biodiversity: evidence from recent scientific literature
A lot of great scientific work has been done lately on population and biodiversity, spanning all areas of the globe. A new study from TOP describes this work and summarizes its main lessons. by The Overpopulation Project Earlier this year, Phil, Pernilla and Frank released A Bibliography of Recent Scientific Work on Population and Biodiversity…
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Wildlife in decline: the impact of human population growth and consumption
In a short film about wildlife loss, Nastaran Rahnama takes a broad approach, investigating food sold in the UK, its production far away, and the links to population growth and declining large mammals. By Nastaran Rahnama In my lifetime including living in Iran, England, and traveling, I noticed that the natural world and the sound…
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Why Overpopulation Should Be a Women’s Issue
The costs of overpopulation and lack of family planning access fall disproportionately on women. Securing women’s rights and ecological sustainability depend on a clear-eyed understanding of this. This raises the question of why there are not more women who are actively involved in the issue of human overpopulation. By Karen Shragg and Madeline Weld An observation…
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Recent blog posts
- The role of mortality in fertility transition studies
- Population growth is still rapid. Has the UN Population Fund (UNFPA) forgotten family planning programs?
- The Most Appropriate Response to Falling Birthrates? Embrace Them
- New paper defends a pragmatic definition of overpopulation
- Because everyone else is (not) doing it: How social pressures may be the key to understand family size preferences
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