Now a day the environmental quality is generating discussions around the world. In this context, the main subject is the global warming and the greenhouse emissions. According to the Intergovernmental Panel on Climate Change studies, the world is experiencing an increase on its average temperature due to anthropogenic emissions that come mainly from burning fossil fuels (primary cause of the increased concentration of CO2 in the atmosphere) causing the greenhouse effect. It is well known that the atmosphere is composed of various gases, however, some of them act like a blanket in the terrestrial coverage (and therefore are commonly called greenhouse gases) due to the fact allow the ultraviolet rays and solar radiation penetrating into the earth s atmosphere and retain infrared radiation, they are: water vapor, carbon dioxide, methane, nitrous oxide and chlorofluorocarbons. Scientists believe that global warming was being intensified due to human activities, especially the beginning of the industrial revolution that have intensified the amount of burning fossil fuels and the forest degradation. According to Stern (2007), the earth s temperature increased about 0.7 Celsius degrees since 1900, for that reason, it is believed that global warming has a close relationship with the increase of the greenhouse gas emissions, especially carbon dioxide (CO2) and methane ( CH4- commonly measured in terms of equivalent CO2). Despite the uncertainty of the consequences of the CO2 emission, especially in the long run, it is expected that there is a relationship between the increase of this gas and the occurrence of climatic disasters in the world, since unlike most pollutants it s externality occur globally and not locally (IPCC, 2007). According to Schipper and Pelling (2006), climate change resulting from increased greenhouse gas emissions should lead to an increase in global average temperature, which will result in changes in rainfall regime in the coming decades and changes in the frequency and magnitude of risks such as floods and tropical cyclones, for example.