The biggest expense was installing the mantle ducts to keep the carbonate-silicate cycle operating.
https://explainxkcd.com/3078/
I took an atmospheric science class in college and the professor described the field as “fast geology”, I like your description though that geology is the study of slow fluids!
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I took an atmospheric science class in college and the professor described the field as “fast geology”, I like your description though that geology is the study of slow fluids!