1. The inadequacy of the present climate governance regime 2. Lessons learned from the climate change negotiations for post-2012: hopes, failures, reality 2.1 The climate change negotiations 2.2 The Copenhagen Accord (lights and shadows) 2.3 The way forward after the Copenhagen Accord 3. The search for a new climate governance regime 3.1 The need for reform of the global environmental governance 3.2 The reform of the global environmental governance: UNEO and other options 3.3 The reform of the global environmental governance: a G-20 for environment and sustainable development 4. Conclusion