What would happen if people disappeared off the earth? The New Scientist investigates…
All things considered, it will only take a few tens of thousands of years at most before almost every trace of our present dominance has vanished completely. Alien visitors coming to Earth 100,000 years hence will find no obvious signs that an advanced civilization ever lived here.
Yet if the aliens had good enough scientific tools they could still find a few hints of our presence. For a start, the fossil record would show a mass extinction centred on the present day, including the sudden disappearance of large mammals across North America at the end of the last ice age. A little digging might also turn up intriguing signs of a long-lost intelligent civilization, such as dense concentrations of skeletons of a large bipedal ape, clearly deliberately buried, some with gold teeth or grave goods such as jewellery.
And then Sterling digs up that Gulf Of Cambay sunken city story from a couple years ago. Four years later, there’s no apparent conclusion to the story, so it’s something for the same file cabinet as the Bimini Road. Putting both stories together makes me wonder just how many times this has happened before, going back 70 million years or so when one sauropod asked his buddy if that comet was worth worrying about. Because you need more things to worry about, here’s NASA’s Asteroid Comet Impact Hazard page.