Pricing CO2 is key to achieve climate change mitigation. While emission trading systems (ETS) are one option– like the one in Europe, or the one which is currently being built up in China –, carbon taxes are another one. They are currently under-used, yet can help stabilizing investor's expectations and hence foster clean technology upscaling. At the same time they can provide much-needed revenues for states to build up infrastructure such as access to clean water or better education. In his keynote speech, concluding the conference, Edenhofer provided lessons learned from the experience of European multilevel climate governance for the international negotiations, for example of how to take into account national preferences in multinational settings. He pointed out that a coordination across a minimum price could be a crucial component following from the international climate agreement to be negotiated by governments worldwide at the Paris summit.
