'Non-survivable': heatwaves are breaching human limits (theguardian.com)

• Wet-bulb temperature thresholds increasingly exceed human biological cooling capacity.
• Systemic risks identified for critical infrastructure and urban habitability.
• Urgent requirement for enhanced thermal resilience in public health strategy.

"Extreme heat events are increasingly surpassing human physiological limits, particularly in regions where heat combined with high humidity renders the body incapable of cooling itself via sweat. This phenomenon, measured by wet-bulb temperatures, presents a systemic risk to public health and urban resilience. As these climate thresholds are breached, the physical viability of densely populated areas is compromised, necessitating a radical re-evaluation of infrastructure design, urban planning, and emergency response mechanisms to prevent mass fatalities."