Brief report:  designing life support systems for space habitats.
Permanent human presence in space beyond low Earth orbit (LEO) is now technically feasible.  To achieve this goal several requirements must be met, which can be summarized as:  technologies, facilities, organization, vision, and will.  This paper describes a recently published NASA Reference Publication, "Designing for Human Presence in Space:  An Introduction to Environmental Control and Life Support Systems" that addresses how to achieve the goal of permanent human presence in space, specifically, how to design and develop environmental control and life support systems (ECLSS) for space habitats.  This includes the technologies that perform the required functions, the facilities where the systems will be developed, and the organization necessary to perform the numerous tasks efficiently.
Wieland
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NASA/Marshall Space Flight Center.
D018504:Ecological Systems, Closed; D004780:Environment, Controlled; D005160:Facility Design and Construction; D006801:Humans; D008021:Life Support Systems / Q000592:standards*; D013026:Space Flight; D014481:United States; D018557:United States National Aeronautics and Space Administration