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Processes to remove and/or recover C02 from air are essential to the long-term success of the U.S. space program. In this paper, the results of a preliminary investigation of the use of a novel membrane-based system for removal of C02 from air are presented. Features of this technology that make it attractive include the following: 1) it is lightweight, 2) it requires no consumables or expendables, 3) it is relatively simple, and 4) it does not rely directly on other subsystems. Preliminary designs of systems for removing C02 from spacecraft cabin atmospheres and from the extravehicular mobility unit (EMU) are presented.