The trace gases of the atmosphere notably carbon-dioxide (CO₂), methane (CH₄), nitrous oxide (N₂O), water vapor, ozone (O₃), and the chlorofluorocarbons (CFCs) are transparent to high energy solar radiation having short wavelength but absorb long wave terrestrial radiation, thus trapping heat in the lower atmosphere. The global atmospheric concentration of these trace gases have been increasing, largely due to human activities, and likely to increase substantially in the future and increase earth's surface temperature. These trace gases is called Greenhouse gas (GHGs). Countries like Bangladesh are not big emitters of Greenhouse gases. Unfortunately, as predicted by the national and international research communities involved in climate change impact assessment, poor countries like Bangladesh, Maldives, etc. would be worse victims of climate change and sea-level rise. Emission estimation were made following the manual of IPCC (1995) titled "IPCC Guidelines for National Greenhouse Gas Inventories". The research work was conducted in the South-western coastal area of Bangladesh during 2005. The total GHGs released from all primary fossil-fuels consumption in Bangladesh during the year 2005 is amounted to 354178 Gg among them CO₂ 34969 Gg, CO 236 Gg, CH₄ 2.82 Gg, N₂O 0.21 Gg, NOx 210 Gg. In the year 2005, total amount of CO2 released from petroleum was 7919 Gg, natural gas 26896 Gg, and coal 154 Gg. An emission trends for the prediction of future emission of CO₂, CO, CH₄, N₂O, NOx from fossil fuels has been calculated. In 2075 total emission of CO₂ will be 13209771 Gg with current growth rate 9.85% for CO 2455397 Gg (Current growth rate 27.50%), CH4 55851 Gg (Current growth rate 24.18%), N₂O 3659 Gg (Current growth rate 30.42%), NOx 1198042 Gg (Current growth rate 24.40%). With an increased load of GHGs into the atmosphere and its consequential effect, a new pattern of temperature, wind and rainfall distribution would result. In the south western coastal region of Bangladesh, saline water intrusion, inundation, and land use pattern changes are the adverse effect of climate change. Through proper study and analysis of GHGs emission from different sources, the problem of natural imbalance can be reduced.