Climate change and also the emergence of agriculture
The first known examples of animal domestication occurred in western Asia between 11,000 and 9,500 years ago when goats and sheep were first herded, whereas types of plant domestication day to 9,000 years ago when wheat, lentils, rye, and barley were first cultivated. This stage of technological enhance happened throughout a time of climatic transition that adopted the last glacial period. A number of scientists have suggested that, although environment change imposed stresses on hunter-gatherer-forager societies by causing fast shifts in resources, moreover it supplied possibilities as brand new plant and animal resources showed up.
Glacial and interglacial cycles associated with Pleistocene
The glacial period that peaked 21,500 years ago was only the newest of five glacial times within the last 450,000 years. In fact, our planet system has actually alternated between glacial and interglacial regimes for longer than two million years, some time known as the Pleistocene. The extent and extent associated with glacial times increased during this time period, by way of a particularly sharp change occurring between 900,000 and 600,000 years ago. Earth is currently in the latest interglacial period, which started 11,700 years ago and is often called the Holocene Epoch.
The continental glaciations associated with Pleistocene left signatures on the landscape by means of glacial deposits and landforms; however, the most useful knowledge associated with magnitude and timing of the various glacial and interglacial times originates from oxygen isotope documents in ocean sediments.