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The terraforming of Mars is the hypothetical process by which Mars's climate and surface would be deliberately changed to make large areas of the environment hospitable to humans, thus making the colonization of Mars safer and sustainable (see Planetary engineering). There are several proposed terraforming concepts, some of which present prohibitive economic and natural resource costs, and others that may be achievable with 'foreseeable technology.'〔(【引用サイトリンク】title=Technological Requirements for Terraforming Mars )〕 == Motivation and ethics == Future population growth, demand for resources, and an alternate solution to the Doomsday argument may require human colonization of bodies other than Earth, such as Mars, the Moon, and other objects. Space colonization will facilitate harvesting the Solar System's energy and material resources. In many respects, Mars is the most Earth-like of all the other planets in the Solar System. It is thought that Mars had a more Earth-like environment early in its history, with a thicker atmosphere and abundant water that was lost over the course of hundreds of millions of years. Given the foundations of similarity and proximity, Mars would make one of the most plausible terraforming targets in the Solar System. Ethical considerations of terraforming include the potential displacement or destruction of indigenous life, even if microbial, if such life exists.〔(THE ETHICAL DIMENSIONS OF SPACE SETTLEMENT ) Martyn J. Fogg.〕〔(The Ethics of Terraforming - Valencia Ethics Review )〕〔Christopher McKay and Robert Zubrin, "Do Indigenous Martian Bacteria have Precedence over Human Exploration?", pp. 177-182, in ''On to Mars: Colonizing a New World'', Apogee Books Space Series, 2002, ISBN 1-896522-90-4〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Terraforming of Mars」の詳細全文を読む スポンサード リンク
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