The aim of this work was to investigate the effect of urine on the absorption of greenhouse gases such as CO2. Human urine diluted with olive-oil-mill wastewaters (OMW) could be used to capture CO2 from flue gas of coal-fired power plant and convert CO2 emissions into valuable fertilizers (mainly, NH4HCO3) that can enhance CO2 sequestration into soil and subsoil layers. Thus, the CO2 emissions could be reduced between 0.1 and 1%. The proposed strategy requires further research to increase CO2 absorption and assess the risks associated with wastewater reuse and xenobiotics in the agroecological environment. (C) 2012 Elsevier B.V. All rights reserved.