

would remain in five or six million years if we all just vanish?
Literally nothing…
10-20k years left and the only thing left would be like Mount Rushmore and other giant stone monuments.
At 5-6 million years it would only be the layer of plastic in landfills from before bacteria evolved to break it down and nuclear test sites if the future society does isotope testing there. Both things that have much more logical explanations than an ancient civilization with no other evidence.
We can’t, we know we can’t.
It doesn’t even take lizard people millions of years ago.
Past 50k years is a blank spot. Anatomically modern humans have been around for at least 300k years.
They say it took the ice age ending so we could have agriculture, but that ignores we had 3-4 ice age cycles before the last one where humans were running around. Plenty of time for agriculture each cycle.
Even then, during the last ice age the Sarah desert was a lush rain forest the entire time.
The modern timeline is very Euro-centric, which is an incredibly naive view considering the glaceriers from an ice age are basically a giant bulldozer that erases everything. It plows down mountains. Obviously we won’t find any evidence there, it keeps getting erased every ice age.
And the places around the equater that would have fostered large settlements, are under the ocean due to those glaciers melting.
Just like with everything else, it’s incredibly ignorant to think we know everything and there’s no missing pieces of the puzzle
As a violent psychopath once said:
https://www.youtube.com/watch?v=ILLZqymJRZI