Terrestrial Views of Global Climate Change
Late Pleistocene World
During the last glacial period. It reached its peak around 22,000 years ago, and the deglaciation process was almost complete by around 11,500 years ago. Due to aridity and cold conditions, resources were widely dispersed. Human populations remained relatively small, and they continually had to move in order to extract resources. This period in human history marks a time of adapting to a wide-range of landscapes and humans migrating around the globe. Lower sea-levels, caused by glaciation, supported the development of land bridges. To better illustrate this, see the following 3 maps.
Early Holocene World
The Earth's surface between 9,500 and 5,500 years ago. Due to Axial and Equinoxial Precession, solar energy stayed with the tropics for longer periods of time. This, along with melt water from deglaciation, caused an abundance of terrestrial water. During this period, humans entered into a wide-variety of symbiotic relationships with plants (and animals). Human populations transitioned from food extraction to food production.