[Throw_Away_5382]

> Climate change is presently believed to be a major catalyst to the development of civilization in Egypt and Mesopotamia. It also thought to have led to the collapse of the Indus River Valley civilization. But it is not thought to have played major roles in the other developments of civilization.

Are you sure about that? From what I have read, climate has a pretty big influence on society, and therefore changes in climate would play major roles everywhere.