over 15 years ago

Terraforming is a process of planetary engineering, specifically directed at enhancing the capacity of an extraterrestrial planetary environment to support life. The ultimate in terraforming would be to create an uncontained planetary biosphere emulating all the functions of the biosphere of the Earth---one that would be fully habitable for human beings.
M.J. Fogg, Terraforming: Engineering Planetary Environments, SAE International (1995).

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