Ten thousand years ago, at the end of the last Ice Age, the human population numbered only a few millions and all their food came from wild plants and animals. Then people began to domesticate some species, so that today almost the entire world population depends for food on a relatively small range of crops and domestic animals. During the 150,000 years that preceded the “agricultural revolution”, anatomically modern humans had colonized most of the the globe and had learned to survive as foragers, subsisting on a great diversity of plant and animal foods. Foragers moved seasonally in small groups to obtain their food supplies and population densities remained low for many millennia.
FORAGING TO FARMING
By 8000 BC, some groups of foragers had settled down and occupied favourable sites year-round. Their populations increased, as restraints on fertility imposed by the seasonally mobile way of life were relaxed, and they ranged less far for their food. This profound change in human behaviour led to the beginnings of agriculture, enabling more people to be supported on a given area of land—although at the cost of the greater effort needed to cultivate crops and raise domestic animals. The effects of settling down, population increase, and growing dependence on agriculture led to increases in the number and size of settlements, to the development of more complex, less egalitarian societies, and, eventually, to urban life and civilization.
The earliest evidence of agriculture consists of the remains of wild species that have been altered in their morphology or behaviour by human intervention. Foremost among the crops are the cereals and pulses (peas, beans and other herbaceous legumes), the seeds of which provide carbohydrate and some protein and are easily stored. They sustained early civilizations and are still staples today. They were domesticated from wild grasses in subtropical regions, for example wheat, barley, lentil, pea and chickpea in southwestern Asia; rice, soya and mung bean in southern and eastern Asia; sorghum, other millets and cowpea in tropical Africa; and maize and the common bean in Mexico. Root crops have also become staples in many areas, such as the potato, which was domesticated in the Andes and is now a major crop of temperate areas, and manioc (cassava), yams, taro and sweet potato, all of which were native to the tropics.
DOMESTICATION OF ANIMALS
Whereas cereals and root crops were brought into cultivation and domesticated in all the habitable continents except Australia (where agriculture was introduced by European settlers in the 18th century AD), animals were domesticated in relatively few areas, principally in western Asia, where there is evidence for the early domestication of sheep, goats, pigs and cattle, followed later by asses, horses and camels. Some forms of cattle and pigs, as well as chickens, were domesticated in southern and eastern Asia, and cattle and pigs may also have been domesticated independently in Europe. Very few animals were domesticated in the Americas—turkey in North America and llama, alpaca and guinea pig in South America—and none in tropical Africa or Australia.
THE SPREAD OF FARMING
The earliest known transition to agriculture took place in the “Fertile Crescent” of southwestern Asia during the Neolithic period starting about 8000 BC. Sites in the Levant have yielded charred seeds and chaff of barley, wheat and various pulses, as well as the bones of domestic goats and sheep. Grain cultivation began here about 1000 years before goat and sheep pastoralism. Dependence on agriculture increased very gradually, paralleled by the spread of village settlement, the development of techniques of irrigation and terracing, and the cultivation of fruits. By the end of the Neolithic in southwestern Asia, about 6000 years ago, agriculture had spread west and east into Europe, northern Africa and central and southern Asia.
Agriculture began independently in China between 7000 and 6000 BC, in the Americas by about 3000 BC and in tropical Africa by about 2000 BC. By the time of the 16th century AD European expansion in the agricultural and pastoral economies occupied most of Eurasia, Africa and Central and South America.
10,000 TO 4000 BC
BEFORE THE FIRST CITIES: SOUTHWEST ASIA
The period 10,000 to 4000 BC witnessed three critical developments: the origins of settled life; the first farming; and the first cities. The origin of agriculture is often referred to as the “Neolithic revolution”, but archaeology reveals only gradual changes in techniques of food acquisition over thousands of years, which by 8000 BC led to villages dependent on food production.
The earliest changes visible in the archaeological record relate not to food production but to social relations, indicated not only in the tendency to reside in one location over longer periods and in the investment of labour in more substantial and more permanent structures, but also in the growth of ritual, an important factor in social cohesion. Indeed it is possible that this “symbolic revolution” was of greater immediate significance than the economic changes we associate with the origins of agriculture.
Lakeshore and riverine sites were important for their rich and varied resources, while the utilitarian date palm flourished in marsh areas in southern Mesopotamia, rich also in fish and waterfowl. The earliest permanent settlements tend to be found at the junctions of discrete environmental zones, with greater access to a variety of resources (for example Abu Hureyra on the boundary of the dry steppe and the Euphrates flood plain, and Ain Mallaha in the Jordan valley). The importance of ritual house fittings and skull cults, perhaps suggestive of the increasing importance of the family and property, is attested at some of the earliest sites (Qermez Dere), while 9th-millennium villages in Anatolia, with early evidence for the cultivation of cereals, contain impressive ritual buildings (Çayönü, Nevali Çori). The carving of stone (Göbekli Tepe, Jerf al Ahmar, Nemrik) and the working of copper (Çayönü) are found well before the appearance of true farming villages. The early use of clay for containers is attested at Mureybet on the Euphrates (9000 BC) and at Ganj Dareh in the Zagros; white lime plaster vessels are characteristic of the latest pre-pottery Neolithic phases, especially at sites in the Levant and Anatolia.
THE DEVELOPMENT OF VILLAGES
Among the best-known pre-pottery Neolithic sites is Jericho, in the 9th millennium BC already a settlement of some 1.5ha (4 acres) with, uniquely, a rock-cut ditch and stone wall with a huge circular tower ascended by means of an internal circular stair. A millennium later Basta and Ain Ghazal in Jordan are farming settlements of over 9.5ha (24 acres). Human skulls on which faces had been realistically modelled were kept by the inhabitants of these sites, while at Ain Ghazal deposits of cultic statues have been recovered.
In the 7th and 6th millennia BC, developed Neolithic villages appear over much of the landscape. They are characterized by economies dependent on domesticated plants and animals, and on sophisticated technological developments (for example an “industrial” area of two-stage pottery kilns, and the presence of lead and copper at Yarim Tepe around 6000 BC). Well-fired painted pottery characterizes these villages, which are often classified by their ceramic styles. One of the most spectacular early pottery sites is Çatalhöyük, 13ha (32 acres) in area, with extensive evidence for wealth in the form of valuable commodities such as obsidian and semi-precious stones. The house fittings bear elaborate ornaments including wall paintings and the plastered skulls of wild cattle.
TRADE AND TEMPLES
An important development attested in the Neolithic villages of north Mesopotamia and Syria is the earliest record-keeping, effected by the use of combinations of small clay tokens and the stamping of distinctive clay or stone seals onto clay lids and other fastenings (most importantly at Sabi Abyad in the Samarran period and slightly later at Arpachiyah). Such simple methods of validating social contracts and other transactions formed the basis of later literate urban recording systems.
Mesopotamia had no metals or semi-precious stones, and by the 5th millennium BC demand for such luxury goods led to the establishment of small colonies in Anatolia, even as far as the Malatya plain (Değirmentepe) and the sea-borne exploitation of the resources