Climate policy is currently in the balance, as was evident this month in Bonn at the first round of UN negotiations since the start of the Ukraine war. On the one hand, governments must become more ambitious, increasing the costs of climate-damaging economic activity and, if necessary, securing this externally through trade measures. On the other hand, they must abide by the rules agreed in the World Trade Organization (WTO), especially at a time when the international order is being shaken. In the journal Science, an international research team has now shed light on how trade policy can help the climate in this situation. The lead author is Michael Jakob, Senior Researcher at the Berlin-based climate research institute MCC (Mercator Research Institute on Global Commons and Climate Change).