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Like the sea farm and mining platform?

Can anyone clarify that?
This question / problem has been solved by DarrkPhoeniximage
There are no penalties beyond what each improvement will do on its own. However, be aware that certain improvements can't be stacked (and you'll receive a warning that building an improvement will destroy and existing improvement).
Every improvement damages the ecology. At some point you will need tech and building to lower the eco-dmg or plants forest and have tree farm/hybrid forest building. You get minerals and food with that.