State of the Planet

News from the Columbia Climate School

Interactive Map: Daily Maximum Wet-Bulb Temperature

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A new study shows that extreme, sometimes potentially fatal, mixtures of heat and humidity are emerging across the globe. The interactive world map below shows documented instances, with hotter colors from yellow to red signifying the worst combinations as measured on the Centigrade “wet bulb” scale. Read the full story: “Potentially Fatal Combinations of Humidity and Heat Are Emerging Across the Globe“. (Map: Jeremy Hinsdale; adapted from Raymond et al., Science Advances, 2020; updated May, 2025)

Usage: Use trackpad or buttons to zoom, drag and drop to move; zoom in to view data points; click points to view temperature and location information.

< 17.75 20 22.25 24.5 26.75 29 31.25 33.5 >
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Collage of Turkiye beach scene and Columbia University Campus with text: UN Climate Change Conference COP31, Antalya, Turkiye, Nov 9-20, 2026

COP31, the 2026 United Nations Climate Change Conference, aims to advance dialogue, strengthen consensus, and accelerate climate action on a global scale. From November 9–20, 2026 in Antalya, Türkiye, heads of state, ministers, scientists, business leaders, and civil society will gather to advance efforts in emission targets, climate finance, and adaptation and resilience. Once again, our experts, students, and global thought leaders from Columbia Climate School and across Columbia University are contributing to key events, sharing insights, and helping shape the dialogue toward ambitious, science-based solutions. Learn More

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