A greenhouse gas, often shortened to GHG is an atmospheric gas that absorbs and emanates radiation within the thermal IR or infrared range. This process causes the greenhouse effect on earth. The chief GHGs in the earth’s atmosphere are carbon dioxide, methane, water vapour, ozone and nitrous oxide. It is projected that if the GHGs continue the emissions at the current rate, the surface temperature of the earth may rise to more than the historical values as early as the year 2047. This will have serious harmful effects on the biodiversity, ecosystems and people’s livelihoods all over the globe.