The principle of common but differentiated responsibility you're referring to appears in both the Kyoto Protocol and the UN Framework Convention on Climate Change. That convention is still the framework for those negotiations. We must clearly continue to apply this principle, which is one of fairness. It is obvious that we won't be able to reach an agreement for after 2012 if this is not fair. No one can be compelled to take part in such an agreement.
As regards the negotiations that we hope will follow the Bali conference, the challenge is to continue differentiating countries by type, while starting to expand the participation of countries like India and China.