Making Mars habitable

@article{McKay1991MakingMH,
  title={Making Mars habitable},
  author={Christopher P. McKay and Owen Brian Toon and James F. Kasting},
  journal={Nature},
  year={1991},
  volume={352},
  pages={489-496}
}
Mars is believed to be lifeless, but it may be possible to transform it into a planet suitable for habitation by plants, and conceivably humans. The success of such an enterprise would depend on the abundance, distribution and form of materials on the planet that could provide carbon dioxide, water and nitrogen. 
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