First published 20121020 / Last updated 20121028
Bread is one of the most typical products of agriculture, and, somehow, bread is agriculture. Like many other people, I assumed that bread is a neolithic invention. In reality, “bread” and other innovations, appeared gradually over time, and well before the Neolithic. All the necessary pre-inventions must have been available: containers to harvest seeds, fire, grinding and cooking, which, by the way, are themselves not “simple inventions”. The same applies to crop agriculture, for which a number of pre-inventions are necessary: tools, some form of soil preparation (note 1), the recognition that plants grow from seed, that seeds need water to germinate and to grow, that they need protecting and, maybe, that they grow faster near human settlements, especially near refuse and animal droppings (fertiliser). Bread predates agriculture, but it is probably the increased demand for bread and other food that has been driving the expansion of crop agriculture, rather than the invention of agriculture permitting an unprecedented population explosion (Note 2).
According to my my little database of inventions, the domestication (note 3) of the main cereals took place around 10000 BP (note 4) for millet (Lu et al
2009), wheat (Eckardt, 2010) and barley (Badr et al 2000, Dai et al 2012) while rice was domesticated later, around 7000 BP (Lawler 2009). The dates are, of course, indicative, but it is generally agreed (Toussaint-Samat 1997, Zohary et al 2012) that cultivated cereals appeared 9 000 to 11 000 BP in the Middle East.
There are good reasons for cooking cereals, as the amount of available energy increases in comparison with the raw, unprocessed grain and the food is more easily digested. It is interesting to note that the forerunner to cooking cereals (i.e. boiling with water) may have been roasting; this had the advantage of removing grain from spikelets and eliminating glumes. For cooking proper, earthenware cooking vessels were needed, but the first evidence of pots that would resist heating dates from 10 000 or 9 000 BP (Mureybet, Syria, not far from the Ohalo sites) and bread is thus older by ten centuries.
Jacob (1954) remains a classic on the history of bread. He wrote that bread is first known from ancient Egypt, and this is actually where the first proper ovens were discovered (from about 6 000 BP). Jacob stresses that barley was not very suitable for this bread, and that this is one of the reasons why barley has been worth less than wheat, starting in early times (note 7.) Jacob’s view is that during the period before “bread”, barley was used to prepare roasted flat cakes, which is indeed what we see at Ohalo. Jacob quotes Plinius’ opinion that, during most of their history, Romans used gruel, not bread (pulte non pane; note 8). Undoubtedly, this applies not only to Romans. It remains that bread did bring a change: it is durable (it can be stored over long periods of time), it is nutritious (the available energy content is greater that that of the unprocessed grain) and it is light (it can easily be carried in a bag).
The most interesting observation that I derive from the paper by Piperno et al is that when humans “decided to launch the neolithic revolution”, some of the fundamental innovations that were needed for the “invention” of agriculture were already to hand. There is bread technology, but there are others. For instance, sophisticated grain storage structures (Kujit and Finlayson, 2009), were invented before agriculture. Cooking pots were available too, as mentioned above. Ceramics as well (note 9). It has been argued too (Craig et al 2011) that, when agriculture arrived at higher latitudes in Europe, people did not change their eating habits, i.e. outputs of agriculture seamlessly fitted into existing food habits.
Bread was indeed a powerful justification for the invention of agriculture. But was bread a necessity? In other words, was something happening that led humans to increase the production of bread, by dramatically expanding the use of known technologies.
Craig et al mention that farming drove rapid global demographic expansion of human populations (1), although reasons for its success are harder to decipher from archaeological evidence. This is a common opinion: thanks to agriculture (both crop and livestock production), population was able to markedly increase. Mazoyer and Roudard (1998) note that, between 10 000 and 5 000 BP, human population increased tenfold, from 5 to 50 million; between 9 500 and 9 000 BP, small villages (0.2–0.3 ha) were replaced by large villages (2–3 ha) and, in general, many changes took place in living patterns.
The prevailing opinion seems to be that agriculture pushed population. My opinion is that it is more likely that population expansion pulled agriculture, that humans were “forced” into the Neolithic revolution. A recent paper by Zheng et al (2012) argues that, possibly driven by favourable climatic conditions, major population expansions started after the last glacial maximum, but before the Neolithic! In another recent paper Dietrich et al (2012) describe the huge celebrations that took place at Göbekli Tepe, which must have placed stress on the economic production of hunter-gatherer groups. Maybe in response to the demand, new food sources and processing techniques were explored. Experts do not agree on the function of Göbekli Tepe (cf Banning 2011), but it is certain that the structure is huge, and the celebrations were huge too. Both the construction of the building and the coordination of the festivals required coordination, which may have been religious.
In the previous version of this post (Gommes 2004), I suggested that competition for natural resources may have become acute and that hotspots (Gommes
et al 2004) of environmental degradation appeared, which in turn led to a drop in productivity. The papers by Zheng et al and Dietrich et al lend support to this hypothesis. With increasing demand for food accompanied by local overexploitation of resources, the time (and the energy) spent in collecting food increased (larger distances had to be travelled); the old food production system became unsustainable, and humans were actually forced into the neolithic revolution, as the pressure of environmental changes, population density and shortage of labour became excessive. Interestingly, there is some evidence (Stevens and Fuller 2012) in Britain that farming arrived around 4000 cal BC, but that it did not last very long. Instead, between 3300 and 1500 BC Britons reverted to pastoralism. The article mentions that This loss of interest in arable farming was accompanied by a decline in population. Again, it is not obvious whether population is driving cropping or the other way round, but the article could mean that when agriculture was no longer needed because of the population decline, humans became herders again! Apparently, the great megalithic monuments were built around that time (note 10).
The passage from hunting and gathering to a new system was a relatively obvious and fast one, though not necessarily easy. In other words, the food production system may have become unsustainable, but the society as a whole adapted to the new situation by resorting to exploitation of accumulated innovations.
I very much believe in the role, and even the necessity of “disasters” (extreme events) to force humans to make greater use of marginal technologies, thereby turning them into “innovations” (Haberle and Chepstow-Lusty 2000. Also see this post). A priori, what is an innovation, or which innovations are important, is difficult to say. Cipolla (2003) confirms this, in a completely different context: innovations, when they first appear, are less important for their immediate advantages than for their potential to stimulate future developments, and that this second, intangible, attribute is always extremely difficult to value.
The chain extending from “neutral” innovations through environmental and societal stresses to the eventual adoption of innovations is one of the basic mechanisms of sustainability. In the same way as hotspots are characterized by an accumulation of environmental and societal stresses, an accumulation of innovations is required to precipitate development into a new direction.
What happened during the early Neolithic? Driven by unknown forces (favourable climate?) human populations started expanding and unsustainably exploiting their environment. They had no option but resort to technology they had known for a long time and turn a hobby into a job, i.e. they invented agriculture… and crops and livestock must have started competing soon! The story of Cain and Abel has always puzzled me: why would God prefer the sheperd to the farmer? Because he was obviously a meat-eating or a meat-eaters’ god. The story may have been the first rehearsal for range wars (note 11).
Note 1. Ploughing is a sophisticated form of land preparation; it is not indispensible, as demonstrated by the growing appeal of no-tillage and low-tillage. Land preparation also includes elimination of previous years’ plant residues (including weeds) to bare the soil and to eliminate competing plants.
Note 2. An early version of this post was published as Gommes, 2004. The original short paper can be downloaded here.
Note 3. A domesticated crop is a crop in which selection by man has developed some desirable traits, including mostly larger and heavier grains than in the wild species, as well as “a non shattering rachis”, i.e. the plant does not spontaneously drop the seeds (grain) once they mature. Instead, they remain attached to the spike and need a human intervention (i.e. threshing) to separate from the plant.
Note 4. BP stands for “before present” or, sometimes “before physics”. The reference date is 1950. See wikipedia.
Note 5. Grinders and pounders have been known from the upper Palaeolithic (between 45000 and 18000 BP); they were used for pigments and medicines of mineral, plant and animal origin. Toussaint-Samat lists the first grain mills as being from around 13000 BP, but Piperno and her colleagues recovered starch from the stones; they were indeed millstones.
Note 6. Mixing a cereal with yeast and water is also the receipe for beer! There is a close link between the histories of bread and beer. This has been addressed for instance by Toussaint-Samat (1997).
Note 7. There are, in fact, several passages in the Bible where barley is sold at half or one-third the price of wheat (2K 7:1, 16, 18).
Note 8. “Pulte”, a word which we find also in “polenta”. See this link for the history of polenta.
Note 9. Jeunesse (2008) wrote a short but dense article about prehistoric innovation. He stresses the fact that many inventions that we regard as “innovations” have actually been around for centuries before their use exploses, often for poorly understood reasons.
Note 10. Göbekli Tepe too was built by pastoralists/hunters. One wonders if the construction of those major structures, which required huge labour inputs, could possibly have been built by crop farmers. Crop farming is much more location bound than herding. It seems actually unlikely that crop farmers could have abandoned their farms over long periods of time to go and help built Göbekli Tepe or Stonehenge. Somehow, one might even imagine that the large investment in metaphysics was not compatible with cropping! There are other examples: during the Little Ice Age, Norse populations in Greenland invested a lot of energy in building wooden churches… instead of protecting themselves against Eskimos (McGOvern, 1981).
Note 11. I cannot help thinking of the famous (and probably apocryphal) quote “Let them eat cake.” When told, during the French revolution, that the people of Paris were rioting because there was no bread, the queen is alleged to have said “Let them eat cake”. When I apply this to the current post, we probably have a period when hunter gatherers were eating cake during huge popular celebrations… until they ran out of food and increased the production of bread!
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