A recent heatwave impacting Europe has prompted experts to re-evaluate how societies approach extreme heat. Armel Castellan of the World Meteorological Organization argues that current heatwaves should be considered a baseline for future, even more intense temperatures. He emphasizes that extreme heat is no longer a temporary event, but a systemic challenge impacting public health, infrastructure, and societal stability. These heatwaves trigger cascading crises, simultaneously straining energy grids, water resources, agriculture, housing, and emergency services. Castellan advocates for proactive infrastructure redesign and adaptation measures to address this evolving climate reality. The focus must shift from reacting to heatwaves to preparing for a consistently hotter climate.