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The large-scale application of technology and principles to modify or manage the global environment of a planet—terraforming being the most extreme example. It involves modeling complex climatology, atmospheric chemistry, and geology to enact change. Projects might include building orbital mirrors to melt ice caps, introducing engineered microbes to alter atmospheric composition, or redirecting comets to deliver water. It's civil engineering, but where your job site is an entire world and your timeline is millennia.
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