The last two years have witnessed a flurry of diplomatic activity on climate change. In addition to the 16 weeks of scheduled inter-governmental negotiations under the auspices of the UN Framework Convention on Climate Change (FCCC), meetings, many at a Ministerial level, were convened by the G-8, the Major Economies Forum, the UN Secretary General, and Denmark, the host of the 15th Conference of Parties (COP-15) to the FCCC. Notwithstanding regular and intense engagement at the highest-level many fundamental disagreements remained in the lead up to COP-15, including on the future (or lack thereof) of the Kyoto Protocol, the legal form and architecture of the future legal regime, and the nature and extent of differential treatment between developed and developing countries.