The setting is earth some year wayyyy in the future.
Because of runaway global warming caused by green house gas emissions planet earth became essentially uninhabitable; a giant ball of hot gas clouds. Everybody died.
Some alien race comes exploring for resources or whatever, but when they get here they find the planet is actually inhabited by the ghosts of all the angry souls that tried to warn people about our impending doom, along with some weirdly evolved flora and fauna maybe idk.
Obviously I haven’t fleshed out all the details, but it sounded like the seed of a cool idea so I wanted to share it and see what people thought before I forget I ever had it.
You need to Planet of the Apes that…
Humans left Earth in the present day and through some wibbley wobbley timey wimey stuff end up flung into the future and don’t realize it.
They aren’t aliens discovering the husk of Earth, they’re us.
Bonus if some of the angry ghosts are friends/family of some of the crew members.