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The Neolithic Revolution and early agriculture

How, why, and when did agriculture first emerge, and what were its implications on human society? Sal explains in an overview. 

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  • leaf blue style avatar for user emmacwrenn
    Why did the regions that Sal showed at approximately develop agriculture and not other areas? Did they have something in common that caused them to do this?
    (29 votes)
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    • mr pants purple style avatar for user Mike Duncan
      The most common thing shared by almost all early agricultural communities is that they are found near major river systems. This provides the fresh water required to both meet the drinking/cooking/washing needs of the community members and animals, as well as the ability to easily artificially water the crops during times of limited rain. Once humanity got better at maintaining their agriculture they created improved methods of sustaining their settlements, and thus were able to spread to areas which had been less ideal previously.
      (37 votes)
  • piceratops tree style avatar for user Ojas Sahasrabudhe
    I think India also had a big role in the birth of agriculture. Am I right?
    (11 votes)
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  • male robot hal style avatar for user Jonathan Herrera
    What is the Ice Age? I don't know because I am barely going to fifth grade.
    (6 votes)
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    • piceratops sapling style avatar for user Joe Williams
      The Ice Ages were a period from around 2 million years ago to 10,000 years ago in which global temperatures were cooler than usual, creating massive ice sheets that covered much of North America, Asia, and Europe. A wide variety of animals had adapted to live in a much colder world, such as the Woolly Mammoth, an elephant covered in long hair. Natural global warming between 20,000 BC and 10,000 BC led to the ancient ice sheets melting away, causing rising sea levels and environmental changes, which led to the Earth looking much like we know it today.
      (14 votes)
  • duskpin sapling style avatar for user Alex Hall
    So like because we were hunter and gathers for a while, meaning the men would hunt and the women would gather berries and stuff. Is that why men are more likely to become color blind than women? Just because they didn't need it so their bodies didn't evolve.
    (6 votes)
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  • area 52 purple style avatar for user Vishaka Vijayaruban
    On the timeline at the start of the video, it looks like the Stone age, Bronze age, Iron Age, and more modern times were a way smaller period of time than one of the ice ages alone. Is that really true?
    (6 votes)
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    • mr pants purple style avatar for user Mike Duncan
      It is true Gowsiya, and the reason comes back to the focus of this video, the birth of agriculture. When tribes were able to stay in one place and not need to devote all of their time to simply making sure they had enough to eat, they had exponentially more time to spend on arts and sciences, thus leading to the creation of the metal alloys those ages are named after, which greatly changed the capabilities of those cultures in turn.
      (6 votes)
  • blobby green style avatar for user Imyselfhappy1228
    If humans hadn't settled down from hunter gatherers then would humans today be hunter gatherers as well? Would it still impact our population?
    (6 votes)
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    • purple pi teal style avatar for user Destin
      If humans had never settled down then that would mean that we probably would have been still hunter gathers, and yes are populations would definitely be a lot smaller, like how Sal stated, it takes a lot of land just to support 100 people, while it takes less to support the same amount of farmers, so instead of our population being around 7.5 billion it would be probably more around 7.5 million, if they spread out across the Earth like we did.
      Hope this helps!
      (6 votes)
  • duskpin tree style avatar for user MoonlearnerQ
    Why was the first ice age shorter than the second?
    (5 votes)
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  • blobby green style avatar for user MalayishaH
    what were some of the first crops to be domesticated
    (3 votes)
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  • blobby green style avatar for user Gabrielle Davis
    This may sound dumb, but are there speculations as to why they started using smoothed tools? I mean like agriculture I guess we didn't have a direct and certain known reason for exactly how it developed but is there a known reason for the smoothed, polished stone tools? I was wondering because I would have felt the sharpened stones would have done more to help developing societies; what could've the smoothed ones done to benefit and advance our world's humanity more than the sharpened ones other than more blunt and heavy impact?
    (3 votes)
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    • starky sapling style avatar for user Wang_Diamy
      Actually, I don't think this is dumb. Maybe the Neolithic people wanted their tools to look nicer. That is literally what I think. People have this sort of natural sense for neatness, I would say. Maybe that's what they wanted. A nicer looking piece of stone.
      (2 votes)
  • piceratops tree style avatar for user JenniferS
    So how did the people lived back then in houses or like did they have to make their own houses out of wood,mud, or something like that?
    (2 votes)
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    • leafers seed style avatar for user seanbcampbell
      Well, everyone has to make their own houses, or other people build them for people. It depended on the culture, I guess. And I don't know whether they still lived in caves and natural shelters, but I would guess that around the advent of agriculture and civilizations they made houses. Probably.
      (2 votes)

Video transcript

- [Sal] This timeline here covers 200,000 years, from 200,000 years into the past, to the present. And just to get a sense of the scale of this, if we were to go 2,000 years ago to the time of the Roman Empire, that would be roughly here on the timeline. If I were to say, when were the pyramids built? That would be roughly there on the timeline. So by human standards this is a very long period of time. And I didn't choose this time span arbitrarily. 200,000 years is about how long we believe anatomically modern humans have been on our planet, our sub-species of Homo sapiens sapiens. Now the reason why I show these stone tools is because the ages, the periods, of modern humanity, or even pre-modern humanity, are named after the types of tools that have been found in archaeological digs. So most of even pre-human, or near pre-human, and human history, has been the Paleolithic period, or old stone age. Paleo, paleo for old, lithic coming from lithos for stone. So Paleolithic. The old stone age is the great bulk of human history. And there's also a Mesolithic that comes about 15,000, 20,000 years ago. But then around 10,000 years ago, the stones have a much more polished appearance to them. Things like this. And so that period from about 10,000 years, starting with about 10,000, 15,000 years, depending on what part of the world you look at, is referred to as the Neolithic period. Neolithic, referring to new stone. And on top of this timeline, I have also shown what's happening at a very large scale, climactically, on the Earth. So these blue periods are ice ages, and these reddish orange periods are the periods in between ice ages. And so you can see the last ice age ended roughly 15,000 years ago, and it began roughly 110,000 years ago. Now I'm giving you all this context about these Paleolithic, Neolithic, and the ice ages, because we're gonna talk about probably the most important series of events, or innovation, in all of human history. And that is agriculture. Agriculture. For most of human history, over this Paleolithic period, over most of this timeline going up until about 10,000 or 15,000 years ago, our ancestors were hunter gatherers. They would have to chase the game wherever it might be, they couldn't settle down in one place. Maybe there were a few that were near some sources of fish where they might be able to do some basic fishing. But they would have done hunting like this. They would have done gathering, which means getting berries or mushrooms where they could find it. It probably was eating a lot of things like insects, and that is most of human history. But then around 10,000 or 15,000 years ago, we have the advent of human beings taking nature into their own hands. Instead of saying, let's just follow the game wherever the game might migrate to, let's actually domesticate these animals. Let's take some of them, start breeding them so they're more suitable for human consumption, so that they are easier to raise, maybe more robust, and we will breed them, and we will raise them for milk, for meat. We also started to domesticate plants. Instead of saying, okay let's just gather those berries there where it happens to emerge, oh let's actually start to plant things. And on a very predictable way, be able to harvest them, and so be able to have a more predictable food supply. Both of these things allowed human beings to have a higher population density, to start to settle down, to have a more sedentary life. And this is a huge, huge, huge deal. Just to get a sense. We believe that the carrying capacity for the planet, for human beings as hunter gatherers, is 10 million people. And that is what we estimate the world population was around the time of the last ice age, or shortly afterwards. And that's because a tribe of 100 hunter gatherers is going to need 50 square kilometers to 100 square kilometers to hunt and gather from, or actually 500, from some of the estimates I've seen. And it might seem like a lot of area that you would need to hunt and gather from, but imagine that you and your family had to go live in the woods now. How much food could you actually find? You'd have to walk miles and miles per day, if you're trying to hunt, you'd have to walk miles and miles per day to get whatever wild grains or berries, or whatever, or mushrooms, or whatever, or insects, that you might consume. But then with the advent of agriculture it allowed for a much, much higher density population. In fact, going from the birth of agriculture, which happens in the Neolithic period, the dawn of agriculture coincides with the Neolithic period, they're often used somewhat interchangeably. Going from that period 10,000, 15,000 years ago, to the time of ancient Rome, so we're on the order of 10,000 years, the world population with agriculture exploded from 10 million to roughly 250 million. And that's 25x. And we know that from the time of Rome 'til now, another 2,000 years with agriculture, our population has gone up 28x, it's growing exponentially, to seven billion. And there's no way that we could have had this level of density without agriculture. Now a key question is, is why did agriculture emerge right then? Well one theory is is, well it seems to be only, and I'll say only in quotes, only a few thousand years after the end of the ice age. Maybe you had positive climate change, at least from a human point of view, that allowed land to support agriculture. That seems like a reasonable theory. Although you might say, well we've had other periods where we didn't have an ice age, how come we see no evidence of agriculture then? And one counterargument or explanation I've heard for that is, anatomically modern humans started to emerge around 200,000 years ago, but that doesn't mean that the way they thought, or that their brains were the same as modern humans. And so maybe in this period the human brain just wasn't capable of performing, or thinking of agriculture. Other theories are is that the human population through hunter gathering kept increasing over time, and it was right after the last ice age that you really got close to this critical mass of population, at which point, for every extra human to be born, another human would not be able to live, or not be able to be born, because there was a fixed supply of food as hunter gatherers. And so you could say out of necessity, maybe a tribe here or a little group there, started to say hey, well what if we started to domesticate some of this cattle? Or if we started to plant crops? All of a sudden they would start to have a higher density and their population could increase. And not only would they be able to survive, but they could also be very dominant in things like conflict. Once you start having agriculture, and as agriculture advances, as I mentioned, these people could be more sedentary. They wouldn't have to move around. They wouldn't have to move around all of the time. That allows them to create even defensive structures. You could have specialization, where not everyone is having to worry about, specialization, not everyone is having to worry about food all of the time. And so you could develop warriors, you could have technology developing, especially weapons, and so not only would that tribe or that group be able to get higher density, but they would be able to defend their property. In fact they would probably care a lot more about property, because they use it to farm, versus hunter gatherers might just view that as their territory that they wander over in order to find food. Now whatever the actual cause of the birth of agriculture, it has had profound implications on our society. You would not have had the birth of city-states, without agriculture. City-states had high density populations. They could not have been supported with hunter gathering. You could not have had the development of technology, which, people needed more time, you needed specialization, in order to have that. It's, I would say, fair to say, we wouldn't even have our modern, our modern civilization would not have been possible without agriculture. I would not be making this video to you right now. In fact most of us wouldn't even have been around on the planet because the planet wouldn't have been able to support our really immensely large population without not only agriculture, but an ever advancing, technologically advancing agriculture. So it might seem like a small thing. You go from hunter gatherer to agriculture, but it's been one of the most, maybe the most profound, well it's probably up there with language and writing, things that have defined what makes humans humans. And to get a sense of where this agriculture was born, here's the various regions that we believe agriculture emerged from. The Levant right over here in the eastern Mediterranean, modern day Middle East, Syria, Israel, Palestine, Iraq, southeastern Turkey, this is one of the areas where we think agriculture first emerged on the order of 10,000 to 15,000 years ago. We believe rice came from China. I've seen estimates anywhere from 6,000 to 13,000 years ago. You have the potato and other crops coming from the Andes thousands of years ago, and this is just a sample of the areas where we see agriculture, both domestication of crops and animals first emerging. And what's interesting is, over time we're likely to discover other places as we have more archaeological digs and we find more fossil evidence of ancient agriculture and ancient peoples. And even the time frame where we believe this happened, the 10,000, 12,000, 15,000 years ago, that's likely to maybe move back a little bit as we discover older and older evidence. So I'll leave you there, but the big takeaway is most of human history we were not only making rough stones for our weapons and our tools, but we were chasing animals wherever we could find 'em. We didn't have predictable food sources. We were gathering fruits and grains, and insects wherever we could to support our families, and there was a limit on how many humans could be around. But shortly after the end of the ice age, it all changed. You had a population explosion, and we think that is due to agriculture.