Climate change is a global phenomenon, which is causing due to emissions of greenhouse gases, mainly from fossil fuels combustion and deforestations. It may cause far-reaching harmful impacts: changes in rainfall patterns might have serious impacts on food production; floods and droughts could become more frequent and may accelerate out-migration; many human and ecosystem services could have serious impacts due to changes in temperature and rainfalls patterns. This research has attempted to evaluate and quantify the greenhouse gases emitted from different points of the wastewater treatment system under various temperatures and oxygen amounts.