In Alaska, Gordon Jacoby (above), Rosanne D’Arrigo, Greg Wiles, and Nicole Davi \used tree rings to date volcanic eruptions and earthquakes. The Lab was able to create a millennial-length record of climate change and volcanic eruptions there. These trees were killed by ash from Mount Churchill around 800 AD. Photo by Nicole Davi
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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