The Kyoto Protocol is a multinational treaty.
 The Kyoto Protocol applied to the seven greenhouse gases listed in Annex A: carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), sulfur hexafluoride (SF6), nitrogen trifluoride (NF3)
As of May 2013, 191 countries and one regional economic organization (the EC) have ratified the agreement, representing over 61

