The Kyoto Protocol seeks to limit greenhouse gas emissions, specifically focusing on six gases:

* Carbon dioxide (CO2)

* Methane (CH4)

* Nitrous oxide (N2O)

* Hydrofluorocarbons (HFCs)

* Perfluorocarbons (PFCs)

* Sulfur hexafluoride (SF6)

The Kyoto Protocol aims to reduce these gases to below 1990 levels, with different reduction targets for different countries.