Abstract: Emitted gasses from the landfills are one of thesignificant sources of air pollution in Iran. Meanwhile, the reduction, controland recycling of such gasses is of great importance from hygienic and globalperspectives. Kahrizak landfill site has been a dumping place for the past 40years. The average amount of wastes disposed at the site is approximately 7000 Tons per day. The purpose of this study iscalculation CH4 (Methane) and CO2 (Dioxide carbon) emissionsand estimate the carbon reduction potential using the Land GEM 3.02 model. Validationof this model was tested by comparing the model estimates with the methane andCO2 recovery rate compiled from the experimental results of Kahrizak landfill between 1994 and 2004. Based on the model results, theCH4 and CO2 emissions between 1992 and 2012 were determinedand sensitivity analysis was performed for various quantities of the decay rate. Through gas-recovery and extracting energy fromlandfills with 75 percent efficiency, the generation rate of greenhouse gaseswill reduce to around 557,633 tons of CO2 equivalent in Iran.