It is rare these days to hear good news about the environment. I believe this is great news.
It is possible to solve the environmental crisis without widespread killing over resources. You don’t need to sell all of your things and move into an off-grid tiny home. You don’t have to buy anything. You don’t have to get any laws passed. You don’t need anyone’s permission or approval. Here’s what you do:
Have one child. And if you do not want children, have none.
That sounds too simple, I know. I’ll explain.
Think of it as a vote:
- Have two children, and you are voting for a population that stays the same.
- Have three or more, and you are voting for a world with more people.
- Have one or none, and you are voting for a world with fewer people.
Before you vote, I’d like to share some information with you.
We need fewer people on Earth. It is not even close.
To maintain such a large population—around 8.3 billion as of mid-2026—humans are emptying the Earth’s bank account. Fast. We are dragging nets along the sea floor and emptying the oceans of life. We have wiped out the vast majority of wild habitats. We have taken so much water out of the ground that cities are sinking and the Earth’s tilt has shifted.
We are in the midst of a sixth mass extinction—a scientific term for when everything seems to be dying and going extinct at the same time. We have billions more people alive than what the Earth can sustainably support. Think of sustainability like this: if each year you take no more than what the Earth can replace that year, you’re living sustainably. As a species, we aren’t even close to doing that. We are surviving because we are mining the Earth for its ecological savings. To live off the interest instead, we need to get our population under 2 billion for sure. Probably lower.
Our global average remains around 2.3 births per woman [1]. We are still growing. We are expected to hit 9 billion people in 11 years, and 10 billion in 35 years [2]. We have to bring that number down, but we do not have to do it through disaster.
Wildly enough, when people hear how we are deep into ecological overshoot (a term meaning a species is using up more than its environment can replace, which is a path toward population decline at best, and extinction or die-off at worst), they start thinking about bunkers, fortresses, and preparing for disaster. That is the challenge with destroying your planet: there is nowhere to hide. Having a year’s worth of food doesn’t matter if the food system has collapsed, or if there is no more underground water to irrigate our farms. If the food web collapses because we killed too many insects, that is a problem that lasts far longer than a year.
Because we produce enough food to feed 8.3 billion people without regular famines, people often assume we are getting close to our sustainable limit, but not quite there. The reality is that we blew past that limit at least a century ago. If one kid becomes the norm, we don’t have to wait two centuries to feel the relief. Right now, on our current path of roughly 2.3 births per woman, we are actively expanding. We are on track to cross 10 billion people in about 35 years. But if humanity shifts to an average of one child, the next generation is simply smaller. The total population won’t plummet overnight, because people alive today will live out their normal, full lives. In just 30 years, the difference between the path we are on now and the one kid path is a world with roughly 2 billion fewer people.
Fast forward 60 years. In a single human lifetime, the large generations alive today will have naturally lived out their lifespans and passed on, replaced by much smaller ones. By that point, the difference between our current path and the one kid path becomes staggering: a world with nearly 5 billion fewer people. This is why you don’t need to move into an off-grid tiny home, and why you don’t need to feel guilty about using energy to heat your house or power a hospital today. We are currently trying to squeeze infinite growth out of a finite planet. By choosing a smaller future, we reduce the drain on the Earth’s limited resources. We grant the physical environment the immediate breathing room it needs to survive. We give ourselves the resources to power our civilization while we figure out how to transition cleanly. We stop compounding the damage. We will need to legally restructure our global financial system so that it no longer assumes infinite growth. That process will be long and difficult. And like any good debt restructuring process, no one will get everything they want. Banks will be furious over their write-downs. Shareholders will be outraged over the drops in stock prices.
Environmentalists will be appalled that we will not stop using fossil fuels or shopping online overnight. We will have to restructure the system so that we can carefully shrink the economy. Doing this peacefully demands that we do not break or disrupt the fossil-fuel-dependent food system that is feeding billions more people than the Earth could otherwise support.
We did not get this deep into overshoot overnight, and we will not get out of it overnight.
If we don’t do this, the financial and ecological collapses will happen anyway. When you withdraw more resources than you replace, you will eventually run out of resources. When you promise to grow forever, as debt-fueled capitalism demands, you will eventually run up against the limits of exponential growth and break that promise. The longer you wait to address these problems, the fewer resources the Earth will have left, and the more people there will be on Earth to suffer the consequences.
And no time to negotiate.
A Tale of Two Timelines
Bankruptcy is a legal process where people and organizations that owe too much money raise their hands and acknowledge they can’t pay the debts. With the help of courts, they negotiate a new deal. You can do this with financial debt. You cannot do this with ecological debt. We are watching two systems move toward collapse at the same time, and we cannot save both. The first system is real. It is the living world: soil, ocean, forest, air. It is made of atoms and energy, and it obeys physical law. The second system is invented. It is the global financial machine: debt, interest, insurance, and profit expectations. It is made of promises, and it obeys belief.
These two systems are in direct conflict. The living world needs less taking, but capitalism demands not only taking, but a constant growth in the taking. It needs more consumers, workers, and taxpayers to be born so that in the future, they can pay the debts of today plus interest.
Capitalism needs you to breed. The planet needs you to have one child, or none if you don’t want children. If enough people choose one child or none, the financial dominoes fall. This is why governments and wealthy people panic when birth rates fall. It may not be obvious why our financial system would need to be redesigned if our global population began to visibly decline. This is because capitalism does not live in the present; it lives on the expectation of the future. The modern debt machine requires a continuously expanding supply of people to pay off tomorrow what we are borrowing today.
When the incoming generation is cut in half through people choosing to have only one child or none, the expectation of infinite growth breaks. The population is now shrinking. We are not talking about “growing less quickly.” Shrinking. The markets will look at the decline, realize the billions of future consumers they were counting on are simply not coming, and Wall Street will have to adjust its models. The key to growing a business is to sell more. That is hard enough as it is. Consistently selling more when the number of customers is intentionally declining, and will continue to do so for at least decades, is impossible.
Humanity collectively will have to file for bankruptcy.
That sounds terrifying because we have been trained to confuse financial collapse with the end of the world. They are not the same. Ecological collapse means the real systems fail: water, soil, climate, food, habitat, and air. That is real collapse. Financial collapse means promises fail: stock prices drop, debt gets reduced or eliminated, contracts change, and institutions reorganize. That is abstract collapse. One destroys the life-support system. The other destroys paperwork.
Bankruptcy does not destroy reality. The houses do not disappear because the housing market crashes. Human knowledge around solar batteries does not evaporate because a stock price collapses. We still know how to grow food, heal bodies, teach children, and care for elders. Yes, life after growth requires a massive redesign. A smaller, younger generation would have to support a larger, older generation. We will have fewer resources available for making dance videos, battleships, and plastic toys because more of us will need to care for our parents and grandparents. Most debts will need to be significantly reduced, or wiped out entirely. Children will probably be annoyed by parents who have too much time and attention to helicopter around them. There will be adjustments.
The argument becomes laughably absurd once you accept one physical fact: the economy cannot grow forever on a finite planet without eventually consuming the resources and living systems on which the economy—and human life—depend. Unless we are trying to feed an economic system that demands endless growth, there is no good reason to keep growing the human population. We have numerous reasons to decrease the population by voluntarily having one child or none. The foundational reasons are to ensure our survival, and that of the rest of life on the only living planet we know of.
More people simply need more of everything: food, water, energy, housing, and land. Providing all of this means draining our underground water reserves, destroying natural habitats, mining more materials, and creating more waste. This puts massive stress on an environment that is already breaking down. The threat isn’t just that everyday life gets harder or less comfortable. The real risk is mass crop failures, running out of water, and triggering a collapse of the natural world that could wipe out other species—and potentially us, too. On a purely physical level, the benefits of having fewer people are obvious. A smaller population uses fewer resources. We wouldn’t need to clear as much land for farming and cities, which means less pollution and less strain on water supplies. Most importantly, it would give nature—forests, wetlands, and wildlife—the space it needs to heal. Having fewer people also gives humanity a crucial safety net. If a severe drought hits or harvests fail, a smaller population wouldn’t be as close to the edge of starvation. It makes feeding everyone easier, taking away the constant pressure to mass-produce resources year after year just to stave off disaster.
Shrinking the population wouldn’t be easy, and the transition would bring real challenges. We would have to figure out how to care for an aging population, adapt cities that were built to keep expanding, and make sure vulnerable communities aren’t left behind. However, these are problems we can solve by reorganizing society. They are much less dangerous than the physical reality of trying to sustain a population size the Earth simply cannot support.
Ultimately, the main reason people oppose a shrinking population isn’t that having fewer people would be bad for humanity or the planet. It’s because it would force us to change our economic system. We would have to abandon an economy based on endless expansion and build a new one focused first on scaling down, and eventually on balance. Simply put, we would have to face reality and stop pretending that economic growth can continue forever.
Nothing good happens when you run out of resources.
The Ethics of Restraint
If you already have two children, or three, or four, this is not an indictment. You are not the enemy of the living world in any way. You built a family based on the world you were born into, the information you had, and the love you had to give. Every child already here is welcome. Every child alive is a reason to repair the world.
What matters now is why we choose to have children moving forward. Most people bring children into the world wanting to give them a full, meaningful life. The math of our current trajectory is brutal. If we keep having two or more children, we are actively voting for a future where those children and grandchildren will almost certainly face unimaginable suffering. They will have to watch billions starve, die of heatstroke, or lose their lives in wars over water. The survivors will be burned with the memory of the horrors they witnessed. If we shift to one child or none, we still have to deal with the consequences of what we have already done to the planet. But we give our children and grandchildren a fighting chance. Right now, the grandchildren of the kids born today, if they make it to adulthood, will be living in a hellscape.
We can do something about that.
This is all a suggestion only; we want this shift to be voluntary. It is a horrible idea to get the government involved. History is full of reproductive violence where the government tells women what to do with their bodies. There are no clean versions of state reproduction mandates, birth quotas, or forced sterilizations. Do not call your senator, member of parliament, or supreme ruler on this one. The decline must be a personal decision multiplied across billions of people. We don’t need everyone to comply. We need enough of us to stop choosing more when the planet is saying less. A small family can be love. A child-free life can be love. One child can be abundance. None can be generosity.
A person who already has children can still be a vital part of this effort. They can raise those children to understand that we have too many people on the planet. A parent can teach their child that the world will benefit if we all have one child or none for a while. They can help make one child, or none, a respected choice instead of a strange one. They can tell their children the truth. The environment we need to survive is collapsing because there are too many of us buying too many things. We are having a hard time buying fewer things, so we are trying to reduce our numbers through fewer births. A child does not need infinite GDP growth. A child needs clean air, safe water, living soil, and time. Time to be held. Time to play. Time to learn the names of trees, rivers, and stars.
We have been taught to read small as failure. Read it instead as repair, as biological sanity, as financial rebellion. It is a refusal to sacrifice the living planet to an invented spreadsheet. The living world is not asking humanity to disappear. It is asking humanity to stop expanding forever. To shrink its impact.
If you didn’t know this before you made your family planning decisions, no big deal. Now you know. From here forward, I urge you to consider the planet when making your family planning decisions.
The planet is saveable. The growth-grind is escapable.
Have one child, or none.
Still Not Sure?
The reader who understands this doesn’t need to read on. That is how we save the planet from environmental destruction, prevent mass extinction, make our own extinction less likely, and do so without catastrophic war, violent uprisings, or famine. Tell your friends, family, and followers.
Some readers may not be convinced. Perhaps you don’t believe there are too many people on the planet. Or maybe you think a financial system that demands infinite growth on a finite planet can work. Maybe you believe the math presented above, but are afraid of what your government will do to you if we take away its future subjects.
The rest of this book is for you. Please read on.