Comment by fodkodrasz
3 days ago
Maybe there were advanced human civilizations on the planet before the current (there are such theories), but at some point they also got so advanced that they accidentally/systematically removed all of their traces, and have declined in some way. (though the theories are have better explanation for their lack of artifacts apart from a few OOPARTs)
Our age unfortunately will have long-lasting traces in the forms of various plastics and forever-chemicals.
And they also took care to replenish the deposits of iron, copper, tin, lead, and rare-earth ores plus coal and oil before ultimately disappearing. Very considerate of them!