The invention relates to a method and to a device for photosynthesis-supported exhaust gas disposal, particularly CO2 disposal. In order to compensate, even locally, for CO2 produced by energy generation or by processing energy carriers, the invention proposes that exhaust gases from combustion processes or chemical processes act as a CO2 source, wherein the exhaust gas is fed directly, or under pressure in water, forming carbon dioxide dissolved in water, into an at least partially closed system, in which rapidly growing photosynthetically active biomasses are cultivated, and that the biomass is harvested cyclically, and that further biomass reproduces automatically from the remaining biomass.
