system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does trash produce methane?

What are the specifics in how trash and landfills are able to produce a lot of methane?
gpt
Organic trash is decomposed by microbes.  The microbes produce methane in their farts, as a waste produce of their metabolism.  A landfill constructed to keep organics together and collect this methane can collect a lot if there is a lot of organic trash.