an idea here: on earth, organisms change the environment, like plants use CO2 for energy and release O2 as a waste product, and animals do the reverse, creating a circular system of CO2 and O2, so in the game it should have this, some parts produce waste products that is released into the environment, using other products in the environment. 
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I think it’s called “dynamic compound production” and is already in development, just wait when devs have time to develop it
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