Over ten years ago, I played a 3D strategy game set on various space stations.
At each station, you had several levels, one of which was a biosphere level full of green. Your task was to build booths and stalls for tourists or visitors to use. They would give you money in return. You could also use your mouse to grab trash and throw it manually in the garbage bins, unless you bought an automated cleaner.
If any of you recognize, let me know the name. Thank you.