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Global climate can be defined as the average of all the regional trends of weather over a long time period (National Science Foundation [NSF], 2009). The researchers all over the world have concluded that the Earth's climate is changing as a whole. There are basically two factors that have impacts on the climate, the natural (climatic and environmental variability) and the anthropogenic (infrastructure development and land use land cover change). The causes of past changes are believed to be related to changes in ocean currents, solar activity, volcanic eruptions, and other natural factors (ISDR, 2008). But in recent times, human activities have accelerated this rate of climate change (IPCC, 2007; Sperling & Szekely, 2005; ISDR, 2008). As the developmental activities increase, the amount of emission of greenhouse gasses and aerosols increases, which, in turn, leads to global warming and snow melting, thus increasing the sea level and the frequency and intensity of cyclones, floods, droughts, and many other disasters (IPCC, 2001).