Carbon dioxide (CO2), Methane (CH4), Nitrous Oxide (N2O), Hydrofluoride carbons (HFCs), Perfluorocarbons (PFCs), Sulfurhexa fluoride (SF6), and compounds that have the property of retaining heat in the atmosphere are called greenhouse gases. Since gases such as sulfur and nitrogen oxides, which have a greenhouse effect, also form acid with rain and return to the earth in the form of acid rains, their harms have been understood earlier, and they are gases that were banned many years ago.