Nitrous oxide has a harmful impact on the global warming although it does not produce in great abundance. N20 is a colourless, non-flammable gas with sweetish odour, which also known as laughing gas and sometime it used as an anesthetic. It is naturally produced by oceans and rainforests; man-made sources nitrous oxide includes nitric acid which is for the use of fertilizers in agriculture. These fertilizers provide nutrients for crops; however, when they break down in the soil, nitrous oxide is released into the atmosphere. In automobiles, cars with catalytic converters produce nitrous oxide at a much lower rate than carbon dioxide, because there is more carbon in gasoline than nitrogen.