COP28 held in December 2023 hosted the first fully dedicated health day providing irrefutable evidence to the global community of climate scientists, policy makers and politicians that the climate crisis is a health crisis.   The health day humanised the climate conversations, making explicit what had been hidden beneath global stocktake analysis and Nationally Determined Contributions planning. Beneath all the figures and graphs are people who are suffering because of the way that we have been living.  Over 140 nations signed the COP28 Declaration on Climate and Health. While it is non-binding sitting outside the formal UNFCCC decision making as a non-negotiated call to action it does mean that now our health ministries will be inside the ‘climate tent’ negotiating, rather than outside separated  from the discussions and decisions which are changing the very nature of health and the infrastructure of health systems.   Behind the Declaration on Climate and Health is a movement. Over 40 million health professionals have added their signature to the WHO call for leaders to be far more ambitious for a future that is healthier, fairer, and greener.  No other community has such solidarity in the climate space, with solidarity comes strength, but also responsibility.