As the Lab got going in the 1970s, its scientists began developing tree ring chronologies across North America. On a talus slope near New Paltz, NY, scientists found old, undisturbed hemlock trees that contributed to a 400-year record of drought variability in the Hudson Valley. Photo by Francesco Fiondella
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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