The 15^th session of the Conference of the Parties to the UNFCCC and the 5^th session of the Conference of the Parties serving as the Meeting of the Parties to the Kyoto Protocol took place in Copenhagen and was hosted by the Government of Denmark. Also sitting were the 31^st sessions of the Subsidiary Body for Implementation (SBI) and the Subsidiary Body for Scientific and Technological Advice (SBSTA), the 10^th session of the Ad hoc Working Group on Further Commitments for Annex I Parties under the Kyoto Protocol (AWG-KP), and the 8^th session of the Ad hoc Working Group on Long-term Cooperative Action under the Convention (AWG-LCA).