Green Sleeves are man made leaves that float in deep space; connected to space stations and orbital habits by long umbilicals.  The first sleeves were translucent boxes made of a poly-hydrocarbon that filtered out dangerous radiation. The standard dimensions were 500m by 500m by 4m. They were filled with phytoplankton or algae that had to be harvested and processed. Modern sleeves are made from monomolecular carbon nets. Their surface area is several square kilometers but their depth is a few centimeters.  These sleeves contain trillions of pigmented microscopic phospholipids discs that carry out photosynthesis and produce pure O2 and sugar.

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