TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Bacterium: The cyanobacterium comprises a photosynthetic cyanobacterium, a nitrogen-fixing cyanobacterium, a cyanobacterium capable of growing in brine, a cyanobacterium that is a facultative heterotroph, or a cyanobacterium that is chemoautotrophic. The cyanobacterium comprises a photosynthetic cyanobacterium Synechococcus species. The portion of the cellulose operon sufficient to express bacterial cellulose comprises the acsAB genes from the cellulose synthase operon stably integrated into the chromosome. The cellulose operon comprises Plac-acsABdeltaC. The cellulose operon comprises an acsABCD operon under control of a PrbcL promoter from Synechococcus leopoliensis. The cellulose operon comprises an acsABCD operon from Acetobacter strain NQ5. The cellulose operon comprises an acsABCD from NQ5 under the control of a PrbcL promoter from Synechococcus leopoliensis. The portion of the cellulose operon sufficient to express bacterial cellulose comprises the acsAB genes from the cellulose synthase operon of Acetobacter species. The portion of the cellulose operon sufficient to express bacterial cellulose comprises the acsAB genes from the cellulose synthase operon of the gram negative bacterium Acetobacter xylinum. The cellulose comprises crystalline native cellulose I, regenerated and native cellulose II, nematic ordered cellulose, a glucan chain association, and/or cellulose acetate. The cellulose synthesizing enzymes are from mosses (Physcomitriella), algae, ferns, vascular plants, tunicates, gymnosperms, angiosperms, cotton and/or switchgrass. The cyanobacterium is a halophilic cyanobacterium capable of photosynthetically producing cellulose in brine. The cyanobacterium comprises a photosynthetic cyanobacterium capable of growing in brine, and produces non- crystalline cellulose and cellulose II as part of its extracellular sheath. The extracellular sheath can be digested with cellulose-degrading enzymes. The cellulose and its extracellular sheath can be processed into cellulosic ethanol. The cyanobacterium can produce cellulose at salt concentrations of greater than 3.5% or 6%. The cyanobacterium is Agmenellum quadruplicatum strain UTEX B2268. The cellulose and its extracellular sheath are processed as a renewable feedstock for biofuel production. The cyanobacterium can fix CO2 while producing cellulose and reduce atmospheric CO2. The cyanobacterium can produce cellulose without the use of fresh water. The cyanobacterium is capable of producing cellulose in saline environments. The cyanobacterium comprises a portion of an exogenous bacterial cellulose operon sufficient to express bacterial cellulose, where the cyanobacterium produces extracellular glucose. The cyanobacterium produces extracellular glucose and cellulose in the form of monosaccharides, disaccharides, oligosaccharides or polysaccharides that comprise glucose and cellulose from photosynthesis. The cyanobacterium comprises Synechococcus sp. PCC 7002, Synechococcus leopoliensis strain UTCC 100, Agmenellum quadruplicatum, UTEX B2268, Nostoc spp., Anabaena spp., Cyanothece spp., Trichodesmium spp. or Synechococcus sp. ATCC 27264. The glucose, the cyanobacterial extracellular polysaccharides or both are further processed as a renewable feedstock for biofuel production. The cyanobacterium can fix CO2 while producing cellulose and reducing atmospheric CO2. The cyanobacterium increases the extracellular production of monosaccharides, disaccharides, oligosaccharides or polysaccharides upon exposure to acidic conditions. The extracellular glucose is exuded from cells or released from extracellular polysaccharides by the actions of one or more endogenous secreted glycosyl hydrolases. The viable cells can be returned to the growth medium after glucose harvest for continued production of cells, biomass, cellulose or glucose. Preferred System: The system for manufacturing bacterial cellulose comprises: (1) growing an exogenous cellulose expressing cyanobacterium in ponds or enclosed photobioreactors exposed to natural sunlight or artificial light generated by LEDs or other devices; and (2) harvesting from the ponds and/or enclosed photobioreactors the cyanobacterium and their exogenous cellulose and /or value added products. The exogenous cellulose expressing cyanobacterium is adapted for growth in a hypersaline environment, such that the cyanobacterium does not grow in a fresh water or a sea water salinity. The exogenous cellulose expressing cyanobacterium is auxotrophic for an amino acid, nucleic acid, a source of nitrogen, a source of sulfur, a mineral, a vitamin or a metal. The exogenous cellulose expressing cyanobacterium sequesters CO2, thereby reducing greenhouse gasses responsible for global warming. The exogenous cellulose expressing cyanobacterium is grown in anywhere in the world as a novel large scale source of cellulose for wood, cotton replacements, biofuels, or value added products including but not limited to pharmaceuticals and/or vaccines, vitamins, industrial chemicals, proteins, pigments, fatty acids or their derivatives (such as polyhydroxybutyrate), acylglycerols (as precursors for biodiesel), as well as other secondary metabolites. Preferred Method: Producing cellulose comprises expressing in a photosynthetic cyanobacterium a portion of the cellulose synthesizing enzymes or operon sufficient to express bacterial cellulose; and isolating the cellulose produced by the photosynthetic cyanobacterium. The cellulose has a lower crystallinity than wild-type bacterial cellulose and the lower crystallinity cellulose is degraded with less energy into glucose than wild-type cellulose. The cellulose has a lower crystallinity than wild-type bacterial cellulose and the lower crystallinity cellulose is degraded with less energy into glucose than wild-type cellulose and is further converted into ethanol to be used as a biofuel and, optionally, that the cells are returned unharmed to the growth medium for continued cellulose and biomass production. Producing a photobiomass comprises: (1) placing a halophilic cyanobacterium comprising a portion of an exogenous bacterial cellulose operon sufficient to express bacterial cellulose, in brine; (2) growing the halophilic cyanobacterium under conditions that promote cellulose production; and (3) separating the cellulose from the brine. The separated cellulose and its extracellular sheath are digested with cellulose-degrading enzymes. The method further comprises processing the cellulose into monomers. The cellulose and its extracellular sheath are renewable feedstock for biofuel production. The cyanobacterium fixes CO2 and thus atmospheric CO2. The cyanobacterium produces cellulose without the use of fresh water. The brine has a salt concentration of greater than 4%. Generating carbon credits comprises: (1) placing a cyanobacterium comprising a portion of an exogenous bacterial cellulose operon sufficient to express bacterial cellulose in CO2-containing brine; (2) generating cellulose with the cyanobacterium, where CO2 is fixed into a cellulose biomass; and (3) calculating the amount CO2 fixed into the biomass to equate to one or more carbon credit units. At least one other carbon is fixed into a cellulose biomass and the at least one other carbon's equate to carbon credit units is included in the calculation. Producing monosaccharides, disaccharides, oligosaccharides or polysaccharides comprising glucose comprises: (1) modifying a cyanobacterium with a portion of an exogenous bacterial cellulose operon sufficient to express and produce extracellular glucose; (2) growing cyanobacterium under conditions that promote extracellular glucose production; and (3) exposing the cyanobacterium to an acidic condition, where the acid increases extracellular glucose production and optionally that the viable cells are returned to the growth medium after glucose harvest for continued production of cells, biomass, cellulose or glucose. The method further comprises processing the glucose into ethanol. The glucose is used as a renewable feedstock for biofuel production. Fixing carbon into a photobiomass comprises: (1) growing a cyanobacterium comprising a portion of an exogenous bacterial cellulose operon sufficient to make cellulose and to produce extracellular glucose in a CO2- containing growth medium; (2) generating glucose with the cyanobacterium, where CO2 is fixed into glucose at a level higher than an unmodified cyanobacterium; and (3) calculating the amount of CO2 fixed into the glucose to equate to one or more carbon credit units. At least one other carbon is fixed into glucose and at least one other carbon is equated to carbon credit unit that is included in the calculation. Producing sucrose from cyanobacteria comprises: (1) growing the cyanobacteria in a growth media; (2) incubating the cyanobacteria in a salt containing medium under conditions that promote sucrose production; and (3) exposing the cyanobacteria to acidic conditions, where the acidic conditions trigger sucrose secretion into the medium. The method further comprises the step of processing the sucrose into ethanol. The sucrose is used as a renewable feedstock for animals. The acidic conditions are created by pumping CO2 into the medium. The acidic conditions comprise a pH of 6 or less. The acidic condition comprises resuspending the cyanobacteria in 10 mM sodium acetate pH 5.2. The sucrose secreted exceeds 1 milligram per milliliter. Fixing carbon comprises: (1) growing a sucrose-producing cyanobacterium in a CO2-containing growth medium; (2) generating sucrose with the cyanobacterium, where CO2 is fixed into sucrose; and (3) calculating the amount of CO2 fixed into the sucrose to equate to one or more carbon credit units. At least one other carbon is fixed into sucrose and the at least one other carbon is equated to carbon credit units that is included in the calculation. The method further comprises processing the sucrose into ethanol. The sucrose is used as a renewable feedstock for biofuel production. The cyanobacterium fixes CO2 and the amount of CO2 fixed is converted into one or more carbon credits. The sucrose is used as a renewable feedstock for animals. The acidic conditions are created by pumping CO2 into the medium. The acidic conditions comprise a pH of 6 or less. The acidic condition comprises resuspending the cyanobacteria in 10 mM sodium acetate pH 5.2. The sucrose secreted exceeds 1 milligram per milliliter. The secreted sucrose is processed into concentrated molasses or dry sucrose crystals. The secreted sucrose is converted into a value added product selected from pharmaceuticals, vaccines, vitamins, industrial chemicals, proteins, pigments, fatty acids and their derivatives (such as polyhydroxybutyrate), acylglycerols (as precursors for biodiesel), or other secondary metabolites. EXAMPLE - No suitable example given.