Global Warming or Global Warming is the process of increasing the average temperature of the atmosphere, oceans and the Earth’s land. Global average temperature at Earth’s surface has risen 0.74 ° C ± 0:18 (1:33 ± 0:32 ° F) during the last hundred years. Intergovernmental Panel on Climate Change (IPCC) concluded that “most of the increase in global average temperatures since the mid-20th century most likely caused by increased concentrations of greenhouse gases due to human activities” through the greenhouse effect. These basic conclusions have been advanced by at least 30 scientific and academic bodies, including all the national science academies of the G8 nations. However, there are still some scientists who disagree with some conclusions that the IPCC noted. Climate models referenced by the IPCC projects show global surface temperature will rise 1.1 to 6.4 ° C (2.0 to 11.5 ° F) between 1990 and 2100. Guesstimate the difference was caused by the use of different scenarios of emissions of greenhouse gases in the future, as well as models of different climate sensitivities. Although most studies have focused on the period up to 2100, warming and predicted sea water level rise will continue for more than a thousand years even if greenhouse gas emission levels have stabilized This reflects the large heat capacity of the oceans. Increasing global temperatures are expected to lead to other changes such as rising sea levels, increased intensity of extreme weather phenomena, as well as changes in the number and pattern of precipitation. Consequences of global warming is another character of agricultural output, loss of glaciers, and the extinction of various animal species.