How long after the extinction of humans will the evidence of their existence disappear from Earth?

I'm gonna claim that manmade glass objects will last tens of millions of years in the driest environments.

I looked it up, ancient Egyptian glass bottles started around 1500BC, so 3500 years ago.


This obsidian (volcanic glass) hand axe is 1.2 million years old. Not suffering much from weathering or other aging. Obsidian will weather in the presence of water, but it takes a few million years. I'm gonna assume some manmade glasses have similar lifetimes.

Good question. I'll say 100 years 🤷🏻‍♂️ how long do you think?

We have fossils that are 3.5 billion years old.

Evidence of humans will vanish with the earth itself.

Until the sun expands and swallows the earth

Wont matter, no one around

Until the death of the sun

Well the pyramids in Egypt, as well as earlier constructions elsewhere around the globe (e.g., in Anatolia), have lingered now for thousands of years, so the built environment won't automatically disappear any time soon, nor will plastics in landfills, nuclear waste, et al.

Could be tens or hundreds of thousands of years to erode all traces away

Never. Well not as long as the planet exists. It's easier to think of everything as data. The evidence of previous data can never be fully cleared without completely obliterating the medium it was recorded on.