Heat is a health crisis. And it’s already here. At last week’s World Health Summit, our plenary session — Heat and Health in a Warming World: Stories and Solutions to Save Lives and Livelihoods — made the case that solutions to extreme heat must be part of a reimagined global health system. From frontline clinicians and community leaders to policy experts and scientists, our speakers shared urgent insights and scalable strategies. Together, they showed how health systems can evolve to protect li