In 2009 we were in Copenhagen for COP15, representing science centres and museums in the fight against climate change. Ten years later, we find ourselves back in the same city. And this time, it’s for crisis talks. The IPCC’s latest report was crystal clear: cut carbon emissions as much as possible and as fast as possible, to mitigate the effects of climate change. What concrete action can we, as science engagement organisations, take now to rise to this challenge?