system
Given the following post, respond as if you're commenting on Reddit:
human
In the distant future, will human garbage landfills become pockets of oil?

Fossil fuels are thought to be massive amounts of organic material that was buried long ago, and transformed by various processes into oil, coal, and natural gas.  Our landfills are mostly organic material, so will there be pockets of fossil fuels created by human concentration of garbage in the very distant future?
gpt
The earth went through a phase called the carboniferous period wherein cellulose and wood lignin had evolved, but no organisms capable of metabolising it existed. Thus the plants could grow and grow and grow and lay down biomass that was effectively nonbiodegradable plastic. Nothing could eat it, nothing could process it, it just choked huge areas of the surface until it built up so thick that layers upon layers of wood and lignin compressed eachother endlessly. Most of the coal we have today came from this.

Our landfills are tiny in relative scale and dimension, and we are likely to eliminate most waste through composting and recycling long before we lay in the trillions of tons necessary to form coal.