International negotiations on climate change have progressed under the principle that nations face “common but differentiated responsibilities” for greenhouse gas (GHG) emission mitigation (United Nations 1992). As a result, it is likely that for the foreseeable future, emission reduction targets in developed countries will remain more aggressive than those in developing countries. Even within the group of developed countries, significant differences in the stringency of climate change policies may persist as countries adopt different emission reduction burdens, or as a result of particular national circumstances.
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