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.
I like this idea a lot.
The thing with the ghosts, reminds me a little of Horizon Zero Dawn - there it’s not literal ghosts but recordings/writings of people from around the time of the calamity which befell earth. Some of them involved in the events, some of them just passive observers of what was happening. I found it a very evocative way to flesh out the backstory as the game went along.
Good luck! 👍