The picture on climate change is bleak. But 30 years of international climate cooperation have had a significant impact. This has included an extraordinary global effort to clarify the science, global agreement of a stabilisation target, an international treaty basis for mitigation and adaptation action, and a wide array of partnerships that have driven up ambition and developed technical solutions. Without this cooperation, the world would already face even more dangerous and irreversible levels of climate change – and would have none of the tools we need to effect a low-carbon transition.