Future Earth: What Will Remain of Humanity After 100 Million Years? — Full Documentary

[00:00:00] Speaker 1: Imagine that one day, the last light from a human city goes out. But Earth does not stop. Tectonic plates continue to shift. Oceans continue to open and close, and new mountain ranges continue to rise. Millions of years pass. Structures once thought to be immortal are eventually buried beneath rock, water, and time. Will our civilization still exist? Waiting for another world to discover it. A civilization can build cities that last for thousands of years. But it cannot build a foundation that lasts for 100 million years. Because over that span of time, continents can drift thousands of miles. Oceans can open or close. Mountain ranges can rise and then erode away. And lands that were once centers of life can become seas or deserts. What is frightening is that none of this requires a catastrophe to happen. Earth simply needs to keep moving as it always has. So, if a civilization truly wanted to survive for 100 million years, what would it have to do when the very planet it calls home is constantly changing? Look down at the ground beneath our feet. It appears motionless, but in reality, Earth's surface is divided into enormous tectonic plates that are constantly moving. A movement invisible to humans can become an enormous transformation for an entire civilization. The history of the continents makes this even clearer. Hundreds of millions of years ago, most of today's continents were once connected within supercontinents such as Pangaea. They later broke apart and moved to their present-day positions. For that reason, the current world map is not a fixed design. It is only a single frame in a movie billions of years long. If a 2,000-year-old city is enough for us to call it ancient, then 100 million years exists on an entirely different timescale. Long enough for the geographic boundaries we consider natural today to become unfamiliar to any civilization of the future. But the biggest problem is not where the continents will be located. The problem is that civilization depends on things that seem fixed on those continents. Humans need fresh water. Agriculture needs suitable land and climate. Cities need rivers, ports, and resources. Trade routes depend on coastlines and terrain. When geography changes, that entire network changes with it. A river can change course. A coastal region can become inland. Fertile land can become arid. A place that was once a center of trade can end up hundreds of miles from the sea. This is especially important because modern civilization is built on the assumption that geography is stable enough for us to plan around it. We build cities for hundreds of years, construct dams for decades, and design economies around today's rivers, coastlines, and resources. But geography also drives an even greater change. Climate, the shape, position, and elevation of continents can affect the circulation of the oceans and atmosphere. NASA has used computer models to study different configurations of future supercontinents. These models suggest that an Earth with continents in different positions could have a climate and regions suitable for life that are very different from those of today. But these are scientific scenarios, not certain maps of what Earth will look like 100 million years from now. If a civilization had to survive for 100 million years, the most frightening question would not be whether it could build enormous cities or travel to other planets. It would be. How many times could it survive the world trying to wipe it out? Over a span of time so vast that all of human history today would seem like only a moment, events that are extremely rare today would no longer be rare. A sufficiently large asteroid impact, a massive volcanic eruption, an ecological crisis, a pandemic, or even a catastrophe created by technology itself, if just one of them exceeded the civilization's ability to recover, it could come to an end. Therefore, to survive for 100 million years, a civilization would need more than just progress. It would have to learn how to survive things that today we can barely imagine. Look at Earth's past, when life went through periods in which entire ecosystems were thrown into upheaval. At the end of the Permian period, about 252 million years ago, one of the largest mass extinctions in history occurred. Massive volcanic activity in Siberia released enormous amounts of material into the atmosphere, contributing to dramatic climate change and causing most species to disappear. About 66 million years ago, a large celestial object struck what is now Mexico, creating the Chicxulub Crater and contributing to the end of the age of non-avian dinosaurs. Events like these reveal something important. Earth does not have to become a dead planet to make a civilization disappear. The environment only has to change faster than the civilization can adapt. Over a short period of time, an extremely rare event may seem almost insignificant. But stretched across tens of millions of years, a civilization would face countless opportunities for such events to occur. A civilization that wanted to survive that long would have to prepare for many different kinds of catastrophes instead of trying to defend itself against only a single threat. Asteroids are one example. We already know that large objects can collide with Earth. And today, humans have begun tracking objects that could approach the planet. But a civilization that survives for another 100 million years could not rely only on hoping nothing happens. It might need early warning systems. The ability to alter the trajectories of dangerous objects, networks of shelters, and population centers independent enough that the destruction of one region would not bring down the entire civilization. But the greatest dangers may not come from outside. Large-scale war, biotechnology, used for the wrong purposes, pandemics, prolonged pollution, resource extraction beyond sustainable limits, or technological systems that humans can no longer fully control could all become existential threats. This is the paradox of progress. Technology helps civilization defend itself more effectively against natural disasters. But at the same time, it also creates greater possibilities for destruction. But even if civilization could survive those shocks, a deeper problem would remain. Because over time, Earth's environment could become so different that humans would no longer simply adapt to the world, imagine a day far in the future when humans wake up in a city where the world outside no longer resembles the Earth they once knew. Air is filtered before it enters every room. Water has been used, treated, and reused many times. Food no longer depends entirely on outdoor fields, but is grown in systems that control light, temperature, and nutrients. Water, temperature, and nutrients. Walls are not only there to protect people from the weather, but to maintain the very conditions necessary for life. That could be the greatest turning point in the history of a civilization. From living within an environment to creating its own environment in which to live. If a civilization truly wants to survive for 100 million years, perhaps it cannot keep waiting for Earth to provide ideal conditions forever. We have already seen that a civilization must survive shocks that can arrive without warning. But living longer than the very environment that nurtured it is something else entirely. But a civilization that survives for millions of years would have to face many different environmental conditions. On the International Space Station, humans cannot open a door to get more water from a river or wait for rain. Every resource has to be used extremely efficiently. This is not a city of the future, but it shows us an important principle. When a system cannot depend on the outside environment, it must recycle its resources internally. If a city could grow most of its food inside enclosed facilities, recycle water, and control temperature, then it would depend less on farmland and outside weather. Creating a living environment is not just about building walls, installing air conditioning, and bringing plants indoors. a real ecosystem is an enormous network of relationships that we still do not fully understand. Bacteria in the soil, insects, plants, water, the atmosphere, and chemical cycles all affect one another. Removing one link can create changes in places no one predicted. Imagine cities beneath the ground, sealed communities sustained by water and air recycling systems, farms in controlled environments, or biological preserves where species are maintained as part of a bank of life. If temperature can be regulated, water can be recycled, food can be produced indoors, and air can be controlled. Then, are humans living in nature? Or are they living inside a life support machine? Homo sapiens is the result of hundreds of thousands of years [00:14:32] Speaker ?: of evolution in a very specific environment. [00:14:37] Speaker 1: What would we have to become to live in such a place? And that could be the true turning point of the next 100 million years. Because if humans can change the environment to protect life, then sooner or later, they may begin to change themselves. Homo sapiens may not be the final form of a civilization that wants to survive longer than its own species. Imagine that 100 million years have passed. Humanity's first cities no longer exist. The oceans have changed. And the generations of humans we once knew disappeared long ago. But somewhere, a civilization continues to function. It still preserves knowledge, still uses energy, still builds and explores. There is only one difference, the beings sustaining that civilization may no longer be Homo sapiens. This is the most astonishing paradox of a civilization that wants to survive for 100 million years. We can imagine a civilization surviving the upheavals of the planet, creating artificial environments and protecting knowledge across countless generations. Before Homo sapiens, many different branches of humans existed, and all of them eventually came to an end. Homo erectus is a particularly notable example. This species appeared about 2 million years ago, and some of the last populations in Java may have survived until around 108,000 to 117,000 years ago. Neanderthals also existed for a very long time before disappearing as a distinct population. But part of their legacy still survives in the genomes of many modern humans. So if Homo sapiens one day no longer exists as a distinct species, that does not necessarily mean that everything originating from us will also come to an end. It does not necessarily mean that everything originating from us will also come to an end. The first possibility is the simplest. Homo sapiens goes extinct. A civilization could disappear along with humanity, or it could survive longer in some form of successor. We may evolve or we may disappear. But there is a second, more intriguing possibility. Homo sapiens does not disappear immediately, but gradually changes over millions of generations. What we know with greater certainty is that human evolution is still taking place. A major study, published in Nature in 2026, using data from more than 15,000 ancient individuals in Western Eurasia, found evidence of natural selection acting on many genetic variants over the past 10,000 years. But Homo sapiens has an advantage unprecedented in evolutionary history. We can change our environment faster than our bodies evolve. Homo sapiens may disappear. Our descendants may naturally evolve into very different populations. It is also possible that future humans will deliberately alter their bodies to adapt to environments their ancestors never lived in. That is the question posed by 100 million years. The survival of a species and the survival of a civilization are not necessarily the same story. If Homo sapiens no longer exists, but our civilization continues, could that civilization still be called a human civilization? A civilization is not made up only of buildings, roads, or machines. It exists because of things far less visible. Language, knowledge, memory, laws, skills, beliefs, and the ability to pass all of them from one generation to the next. Consider the Roman Empire. When the Western part of the empire collapsed, the Roman society did not disappear completely in a single moment. Latin continued to evolve. Laws and ideas were adopted by later societies, while techniques and structures became part of Europe's heritage. A center may die, but fragments of its information can find new hosts. Imagine an archive containing all the knowledge of the 21st century remaining intact after a million years, but the language has changed. The technology needed to read the data has disappeared, and no one knows what those symbols mean. Would that archive still be a library? Or would it simply be a mysterious object? Major archival institutions must continuously copy, convert, and update data because hardware and technical formats can become obsolete. The U.S. Library of Congress views the long-term preservation of digital data as an ongoing process because a file preserved today is not necessarily guaranteed to remain readable in the future. This is a small, but very important lesson for 100 million years. A civilization that wants to survive for a long time must pass on both knowledge and the methods needed to use that knowledge. one branch may remain the biological descendants of humans. Another branch may have been profoundly altered by technology. One branch may rely more heavily on machines to store and process information. After millions of years, they may no longer see themselves as a single community, but they all share a common origin. If one branch disappears, the tree does not necessarily die. And if the original trunk is gone, the new branches may still carry traces of it. When those fragments come together again, [00:23:05] Speaker ?: when those fragments come together again, [00:23:05] Speaker 1: a new civilization may emerge from the ruins of the old one. So after 100 million years, how will Earth remember us? Imagine that 100 million years from now, humanity has completely disappeared. But when another civilization digs deep into ancient rock layers, they discover something strange. A radioactive signal that appears suddenly. Materials unlike anything produced naturally. An unusual shift in the distribution of living organisms. And a layer of sediment recording a period when the planet seems to have changed very rapidly. They find evidence that something once interfered with this planet. We may disappear from the surface of Earth, but still leave traces in its geology. However, even those traces are not immortal. The first thing that may disappear is the very thing we are most proud of, cities. But what is remarkable is that the disappearance of a city does not mean its story disappears. Materials that were once manufactured, substances that were once released, and changes humans caused to the environment that may be preserved somewhere far less obvious, in sediment. We have already seen this in the present age. At Searsville Lake, California, scientists have studied sediment cores that record more than a century of changes in the region. In them, they identified the appearance of plutonium-239 and plutonium-240 along with many other signals such as cesium-137, mercury, lead, and changes in microfossils. These signs are associated with industrial activity, agriculture, landscape change, and radioactive fallout from nuclear testing. So what if a civilization survived for far longer and affected the planet on a much larger scale? Humans have changed land use, moved species across unprecedented distances, transformed landscapes, altered material cycles, and created new ecosystems. So a future scientist might not find a human city, but instead see a simultaneous change in the records of many species. Pollen could reveal changes in vegetation. Fossils could show that some species disappeared or expanded their ranges. Sediment could record changes in erosion rates. Individual signals might be difficult to explain. But when they appear together within a relatively short period of time, they could form evidence of an unusual agent. That is why the geological record preserves not only objects, but also the consequences of a process. Then a stranger kind of evidence appears. Then a stranger kind of evidence appears. Artificial materials. Microplastics have now been widely detected throughout the environment. An object may disappear very quickly, but its components can enter soil, water, and sediment, and then become part of the geological record. However, this is where the story becomes more complicated. Earth is not a hard drive. It does not simply store information, but continuously destroys and recycles it. Sediment can be eroded. Rock can be buried deep underground, metamorphosed, and then uplifted again. Rock layers containing traces of us the geological cycles may be broken apart or absorbed into other geological cycles. Therefore, we cannot say that every trace of humanity will certainly remain intact after 100 million years. We may disappear physically, but still exist as a signal. The geological record may preserve evidence, but it does not necessarily preserve the explanation. These anomalies may become dots that a future intelligence connects to uncover a story that we ourselves once thought would be forgotten. It becomes the story of one day carrying a part of civilization beyond Earth, before this planet itself becomes the only place left that remembers we ever existed. Earth is still green beneath the light of the sun. [00:29:19] Speaker ?: Earth is still green beneath the light of the sun, Earth is still green beneath the light of the sun, Earth is still green beneath the light of the sun, [00:29:22] Speaker 1: Earth is still green beneath the light of the sun, Earth is still green beneath the light of the sun. Earth is still green beneath the light of the sun, Earth is still green beneath the light of the sun. Earth is still green beneath the light of the sun, Earth is still green beneath the light of the sun, Earth is still green beneath the light of the sun, but humanity no longer lives in only one place. Earth is still green beneath the light of the sun, [00:29:35] Speaker ?: Earth is still green beneath the sun, but humanity no longer lives in only one place. 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[00:31:25] Speaker 1: Earth is still green beneath the sun, Earth is still green beneath the sun, Earth is still green beneath the sun, Earth is still green beneath the sun, Earth is still green beneath the sun, Earth is still green beneath the sun, Earth is still green beneath the sun, Earth is still green beneath the sun, Earth is still green beneath the sun, Earth is still green beneath the sun, Earth is still green beneath the sun, [00:31:36] Speaker ?: Earth is still green beneath the sun, [00:31:45] Speaker 1: Earth is still green beneath the sun, Earth is still green beneath the sun, Earth is still green beneath the sun, Earth is still green beneath the sun, Earth is still green beneath the sun, Earth is still green beneath the sun, Earth is still green beneath the sun, Earth is still green beneath the sun, [00:31:53] Speaker ?: Earth is still green beneath the sun, Earth is still green beneath the sun, Earth is still green beneath the sun, Earth is still green beneath the sun, 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beneath the sun, Earth is green beneath the sun, Earth is green beneath the sun, Earth is green beneath the sun, Earth is green beneath the sun, Earth is green beneath the sun, Earth is green beneath the sun, Earth is blue beneath the sun, replacement parts. A crop fails inside a closed agricultural system. On Earth, people can call a technician, ship supplies, or switch to another source. On Mars, every option becomes far more difficult. A civilization beyond Earth becomes truly independent only when it can produce most of what it needs to be. It needs to continue existing on its own. Distance also creates a problem that technology cannot completely eliminate: the delay imposed by the speed of light. When Mars is closest to Earth, a radio signal takes about four minutes to travel one way. When the two planets are farthest apart, that time can reach about 24 minutes. That means a question sent from Mars and an answer returned from Earth could take nearly an hour for the round trip. That is not too serious for a conversation, but it becomes a problem when a system must respond immediately. A society on Mars would eventually have to learn to make its own decisions without waiting for instructions from Earth. And this is where an engineering problem becomes a problem of society. But then 100 million years pass, and the distances between worlds grow greater. The original communities have produced countless generations of descendants living beneath different skies, under different gravity, with different environments and different needs. But if their bodies change, their living worlds change, their languages change, their cultures change, and even those descendants no longer live primarily on Earth, then one final question becomes unavoidable. What must we preserve in order to still call them human? Imagine that one day, 100 million years from now, an intelligent being discovers traces of us in ancient layers of rock. Homo sapiens first appeared only about 300,000 years ago. Compared with 100 million years, our history is only an extremely brief moment. And the evolutionary history of humanity itself shows that there is no reason to think our present form will exist forever. Homo erectus first appeared about 1.9 million years ago, and survived many times longer than Homo sapiens has existed so far. But eventually, it too disappeared. Neanderthals, Denisovans, and many other ancient human branches also once existed. Homo sapiens also became, adapted, survived through extreme changes, and then disappeared or merged into other evolutionary lineages. This shows that human has never been a fixed form. It has always been a changing branch. Over the next 100 million years, there are at least three major possibilities. Homo sapiens could become completely extinct. Homo sapiens could become completely extinct. Our descendants could continue to evolve naturally in new environments. Or humans could begin deliberately altering their own bodies and genomes. Today, gene editing technology has transformed the idea of intervening in DNA from science fiction into a real possibility in medicine. There is still an enormous gap, both scientifically and ethically, between treating disease and designing an entirely new generation of humans. Therefore, we cannot know exactly what future humans will look like. What we can say with greater certainty is this. Over a time span as long as 100 million years, both evolution and technology could profoundly alter the characteristics we now consider human nature. A civilization does not necessarily have to preserve the same body, the same nation, or even the same species. What does not matter more is the ability to pass on information and continue building on what previous generations left behind. Consider human history itself. Humans who lived hundreds of thousands of years ago had no cities, internet, or satellites. But the tools they created, the footprints they left behind, and the changes they made to their environment became part of the story that led to us. If one day no one resembles us anymore, but there is still a being that looks back into the past and knows that everything began with a small species that once lived on this earth, have we truly disappeared? Or have we simply become the first chapter of something greater? And to answer that final question, we must look back at this entire journey. 100 million years from now, if there is no longer an "us", what will truly remain? 100 million years from now, the hardest thing to survive may not be humans. It may be the very concept of "human". A civilization may disappear. A species may go extinct. Or something entirely new may emerge from the legacy of Homo sapiens. And if one day another civilization looks back at Earth and discovers traces of us in the rocks, they may not know whether we failed, or whether we became something far beyond ourselves. A species may not be the same. [00:40:08] Speaker ?: A species may not be the same. A species may not be the same. 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A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. [01:00:14] Speaker 1: A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same. A species may not be the same.