NOVELTY - Business method dealing in emission rights, by performing agriculture by composite fermentation using carbon dioxide (CD) and water, in desert and farmland; manufacturing alcohol using starch as raw material; making value of agriculture of waste-material to zero; manufacturing ethanol and isopropyl ether; manufacturing biomass fuel safer than gasoline and selling it as fuel for motor vehicle; and thus enabling reduction of CD.    USE - (M1) is useful in business method dealing in emission rights. (M1) is useful in manufacturing biomass fuel for use in motor vehicles and power station (claimed).    ADVANTAGE - (M1) enables efficient manufacture of a biomass fuel which is more safer than gasoline, having suppressed noxious and hazardous waste and carbon dioxide emission property, where the consumption of fuel is improved.    DETAILED DESCRIPTION - Business method (M1) dealing in emission rights, involves performing agriculture by composite fermentation using carbon dioxide (CD) and water in air as raw material, in desert and farmland, for reducing CD, making a portion of the harvested crops as food or feed, using remaining starch, saccharides etc., as raw material for manufacture of alcohol by composite fermentation technique, improving soil using composite ferment-microbial flora while carrying out agriculture by composite fermentation, making value of agriculture of waste-material to zero, manufacturing ethanol, isopropyl ether tertiary butanol, MTBE and ETBE from manufactured alcohol, preventing suppression of metal (preferably aluminum) corrosion and deterioration, corrosion of rubber, resin by performing bio-enzyme catalyst processing, manufacturing a biomass fuel more safer than gasoline, having suppressed noxious-hazardous wastes and CD emission property when compared with gasoline and selling it as a fuel for motor vehicle and power station and thus enabling reduction of CD by its consumption as a whole system, where the bio-enzyme catalyst comprises a conjugate of multimeric enzyme and a composite ester.