The key barrier to further, faster action against climate change is the lack of financial and technical support for green, resilient and just transitions mechanisms to mobilise the trillions in public and private finance needed for the 1.5°C transition. Looking towards this critical decade, European diplomacy has the potential to help bridge the trust, confidence and finance gaps, if cooperation and climate-just approaches are at the centre of EU external action. As a global actor, the EU can play a key role not just in deploying its external action to drive transitions and resilience in other countries, but also in driving reforms to make its external action fit for a climate-changing world, for tackling loss and damage and adaptation, and for doing the above in a gender-sensitive way.