We are not as great as we think.. 
Scientist have always suspected that great societies once existed. There have been many legends of the city of Atlantis that was destroyed and many different cultures have their own tales of previously existing groups.
Archaeologist have gone to the jungles of South America and into the forests of south Asia and found remnants of once great cities. Only parts of these ruins can be seen and guesses are rendered as to what, when, and why they existed. Now with the advent of new technology, the other part of the picture can be seen from outerspace via infrared cameras. These cameras can see the outlines of streets, waterways, and parts of once existed buildings. When the whole picture is put together, the ancient cities come to life showing a population of a million people over 2 thousand years ago. Why did they perish? The theory is that the inhabitants outgrew the area by overpopulation and exhausting the natural resources in the area. This in turn caused many nature disasters, which impacted the population and reduced the people to zero. Only fragments of their civilization exist, while their cities eventually was reclaimed by nature’s forest.
Man’s feeling for his superiority over nature must always yield to nature. For example, in the US, San Francisco has always been plagued by earthquake and fire. Along that stretch of the west coast of the US, fire has always existed to control the growth of forest every 30 years. Yet there are many great trees that exist in that area that date back several thousand years. Nature has provided these trees with tannic acid that retards burning of the barks of theses trees and only the underbrush is swept away by fire. But the people who lived in the area did not want to allow fire to take its course, so San Francisco, instead of having a fire every 30 years, has not had a fire for over 150 years. This is a ominous sign and a catastrophe waiting to happen.
Moral: Man can not control all that he sees, mother nature will take care of man’s needs.
