Extreme heat poses significant risks to public health, infrastructure, and the economy. In California, seven major heat events from 2013 to 2022 resulted in 460 deaths, over 5,000 hospitalizations, and $7.7 billion in damages. Vulnerable populations, including low-income communities and outdoor workers, are at heightened risk. The state has already experienced historic triple-digit temperatures earlier than average in 2026, exacerbating health and environmental challenges. Globally, extreme heat affects urban centers, leading to shared challenges in governance, planning, and investment. The impacts are severe and require urgent, coordinated action to protect lives and livelihoods.