Explanation:

About Kyoto protocol:
Kyoto Protocol is the first major step toward reduction of green house gases. It commits industrialized countries to stabilize greenhouse gases. The Kyoto Protocol was adopted in Kyoto, Japan, on 11 December 1997 and entered into force on 16 February 2005. The detailed rules for the implementation of the Protocol were adopted at COP 7 in Marrakesh, Morocco, in 2001, and are referred to as the “Marrakesh Accords.” Its first commitment period started in 2008 and ended in 2012. The reason for the lengthy time span between the terms of agreement being settled upon and the protocol being engaged was due to terms of Kyoto requiring at least 55 parties to ratify the agreement and for the total of those parties emissions to be at least 55% of global production of greenhouse gases. USA reject this protocol in 2001.
Participating countries that have ratified  the Kyoto Protocol have committed to cut emissions of not only carbon dioxide, but of also other greenhouse gases: a) Methane (CH4) b) Nitrous oxide (N2O) c) Hydrofluorocarbons (HFCs)  d) Perfluorocarbons (PFCs) e) Sulphur hexafluoride (SF6).