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The use of biomass boilers to heat greenhouses is increasing due to the lower biomass cost compared to other fuels such as gasoil or gas. Furthermore biomass fuels are considered environmentally suitable to have a zero balance for CO 2. Moreover, in addition to heat, biomass combustion produces CO 2 that can be used to enhance the production of crops. The aim of this work was to develop a system for recovering CO 2 from the flue gases of biomass combustion and its supply into the greenhouse. The CO 2 capture was performed by adsorption on activated carbon that has the capability of selectively retaining the CO 2 at high pressures and low temperatures. The investigation was carried out at Fundación Cajamar in Almería in a 'parral' greenhouse with an area of 887 m 2. During the daytime hours, the CO 2 greenhouse dose was 9 g CO 2 h-1 m-2 , and it was necessary to use the heating system for 4 h day-1 to capture the CO 2 required. Both the biomass boiler and the CO 2 capture system, resulted in a 2°C increase in air greenhouse night temperature and a mean CO 2 concentration around 600 ppm during the daytime hours. This system can improve yield and reduce CO 2 emissions to the atmosphere with the corresponding environmental benefit.