ABSTRACT

The report published by the Inter Governmental Panel on Climate Change (IPCC 1990) clearly demonstrates that human activities result in the generation of four greenhouse gases (GHGs) into the atmosphere. These gases are carbon dioxide (CO2), methane (CH4), chlorofluorocarbons (CFCs), and nitrous oxide (N2O) that are contributing to the global warming phenomena considerably. The global warming caused by the increased levels of these gases is one of the most serious environmental threats to the human race at present (Yeh and Bai 1999). CO2 emitted into the atmosphere is assumed to cause the greatest adverse impact on the observed green house effect accounting for approximately 55% of the observed global warming (IPCC 1990).