What does the social makeup of each society say about the environment in which that civilization developed?

What does the social makeup of each society say about the environment in which that civilization developed?
What are the main differences between ancient and modern civilizations, and why do you think that difference exists?
Finally, I would like you (on the back) to diagram what you think society will resemble in 2100 CE, and explain your reasons for your prediction. (Please use examples to support your logic!)