The resources of Mars for human settlement.
Spacecraft exploration of Mars has shown that the essential resources necessary for life support are present on the martian surface.  The key life-support compounds O2, N2, and H2O are available on Mars.  The soil could be used as radiation shielding and could provide many useful industrial and construction materials.  Compounds with high chemical energy, such as rocket fuels, can be manufactured in-situ on Mars.  Solar power, and possibly wind power, are available and practical on Mars.  Preliminary engineering studies indicate that fairly autonomous processes can be designed to extract and stockpile Martian consumables.  The ability to utilize these materials in support of a human exploration effort allows missions that are more robust and economical than would otherwise be possible.
Meyer
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Boulder Center for Science and Policy, Colorado 80306, USA.
McKay
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D001272:Atmosphere; D002245:Carbon Dioxide / Q000032:analysis; D003247:Conservation of Natural Resources; D004602:Elements; D004736:Energy-Generating Resources; D005118:Extraterrestrial Environment; D055593:Geological Phenomena; D005844:Geology; D018535:Mars; D008906:Mining; D012987:Soil / Q000032:analysis*; D013026:Space Flight; D014867:Water / Q000032:analysis*
D004602:Elements; D012987:Soil; D014867:Water; D002245:Carbon Dioxide