The history of agriculture is closely tied to climate changes, or so it certainly seems from the archaeological and environmental evidence. After the Last Glacial Maximum (LGM), the northern hemisphere of the planet began a slow warming trend. The glaciers retreated northward, and forested areas began to develop where tundra had been.
By the beginning of the Late Epipaleolithic (or Mesolithic), people moved northward, and lived in larger, more sedentary communities. The large-bodied mammals humans had survived on for thousands of years had disappeared, and now the people broadened their resource base, hunting small game such as gazelle, deer and rabbit, and gathering seeds from wild stands of wheat and barley, and collecting legumes and acorns. But, about 10,800 BC, the Younger Dryas period brought an abrupt and brutal cold turn, and the glaciers returned to Europe, and the forested areas shrank or disappeared. The YD lasted for some 1200 years, during which time people survived as best as they could.
History of Agriculture After the Cold
After the cold lifted, the climate rebounded quickly. People settled into large communities and developed complex social organizations, particularly in the Levant, where the Natufian period was established. Natufian people lived in year-round established communities and developed extensive trade systems to facilitate the movement of black basalt for ground stone tools, obsidian for chipped stone tools, and seashells for personal decoration. The first stone built structures were built in the Zagros Mountains, where people collected seeds from wild cereals and captured wild sheep.
The Aceramic Neolithic period saw the gradual intensification of the collecting of wild cereals, and by 8000 BC, fully domesticated versions of einkorn wheat,