The international community reached a new accord to tackle climate change during the 21st Conference of the Parties (COP) held in Paris in 2015. The so-called 'Paris Agreement', signed by 195 countries, represents the most comprehensive and far-reaching climate accord ever achieved. Consequently, President Trump's decision to withdraw the United States from the Paris Agreement in June 2017 sent shockwaves through the international community. How should the EU respond to this setback? The COP23 conference held in Bonn in November 2017 should provide Europe with the opportunity to assert its leadership role in the climate regime.