system
Given the following post, respond as if you're commenting on Reddit:
human
Will the contents of landfills eventually fossilize?

What sort of metamorphosis is possible for our discarded materials over millions of years? What happens to plastic under pressure? Etc.
gpt
Under pressure, landfills are unlikely to have their objects slowly replaced by dissolved calcium.

What’s more likely is that all the plastic in landfills will prevent bacteria from breaking down the contents properly, with the result being a gradual dissolving of all hydrocarbons into oil, just like what happened with early biomass before bacteria evolved that could process lignin.