Tenth Session of the Conference of Parties (COP 10), 6 - 17 December 2004, Buenos Aires, Argentina COP 10 was held at "La Rural", Av. Sarmiento. The sessions of the Subsidiary Body for Scientific and Technological Advice (SBSTA 21) and the Subsidiary Body for Implementation (SBI 21) was held in conjunction with COP 10 (6 – 14 December).