The 21st Conference of the Parties to the United Nations Framework Convention on Climate Change (COP21) took place in Paris between 30 November and 12 December.
Cynhaliwyd yr 21ain Gynhadledd Partïon Confensiwn Fframwaith y Cenhedloedd Unedig ar y Newid yn yr Hinsawdd (COP21) ym Mharis rhwng 30 Tachwedd a 12 Rhagfyr.