The fact that "developed nations, in reducing emissions, will bear most of the cost while the developing world will get most of the benefits" does not mean it's

The fact that "developed nations, in reducing emissions, will bear most of the cost while the developing world will get most of the benefits" does not mean it's not a good idea to reduce emissions, it means that an agreement between the two is unlikely to happen. It is an empirical claim, not a normative claim.