NASA Study Asks: Did Pre-Human Industrial Civilization Inhabit Earth?

What if humanity was not the first industrial civilization? What if, untold millions of years ago, amid the climate fluctuations and the struggles for dominance between the species, a society arose? Would its traces be detectable in the rocks and soil, the element isotopes themselves, after such a long period?

The hypothesis is an exercise published recently in the International Journal of Astrobiology. And although the scientists have their doubts about a proto-human population dominating the globe long before humanity’s family tree sprouted branches, they nonetheless hold that the investigation holds scientific value. Read more.