|There is also an amazing feature in the deserts. In the English Patient, a cave was discovered to have ancient sketches of people swimming and doing their daily activities. There is clear evidence that there is no lack of water then. How is it possible for lakes to exist in the midst of desert dryness?|
Ice ages are typically a little over 100 000 years long, are separated by interglacials about 15 000 years long. We live in an interglacial that began about 15 000 years ago. Our ancestors therefore lived in an ice age which causes much changes in the world's climate.
Even during a full ice age the forests of East Africa do not freeze, but when the Earth is colder, less water evaporates from the oceans to fall as rain, much of the fresh water of the planet is locked up in ice. In East Africa an Ice Age is better describes as a dry age.
During the droughts the forests shrank, and the inhabitants had to find another way of life. Some retreated with the forests, becoming even better tree-dwellers. But some moved on to the spreading plains, adapting to a new way of life. When the forests shrank, the apes with the best adaptibility and intelligence would survive. After a few dozen turns of glacials, the decendants of all the survivors have exploded in population to dominate the planet.
About 10 000 years ago, the world had undergone an ice age in which the world undergone lower temperatures. It is found that some of the temperate zones now was like Antarctica and Africa had then a more temperate climate which supported lakes and seas Therefore, human civilization existed at where deserts lie now