Trade has become a taboo topic in climate negotiations on the implementation of the Paris climate agreement. This must change. The nexus between trade and climate change must be addressed in the climate regime. In particular, a definition is needed that will clarify the meaning of a climate “response measure.” Without a definition provided by climate negotiators, the task of defining which national climate measures are permissible and which are not when they restrict trade while pursuing climate mitigation and adaptation will be left to the judges of the World Trade Organization. To avoid a collision between the climate and trade regimes that will potentially be harmful to both, the ongoing deliberation on response measures in the climate regime must be reframed by ending the climate taboo on trade.
