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Climate change is considered one of the most serious threats to the global environment. Increasing concentrations in the atmosphere of greenhouse gases (GHGs) such as methane, nitrous oxide, hydro fluorocarbons, per-fluorocarbons, sulphur hexafluoride and most importantly, carbon dioxide have been implicated to be the primary reason for global climate change. International concern about this problem led to the establishment of the Inter-governmental Panel on Climate Change (IPCC) in 1988.