The Lab’s tree ring work in the U.S. Southwest documents a history of drought. Ed Cook (above) published a landmark paper in 2004 describing past mega droughts that extended for hundreds of years. Later work with the bristlecone pines tracked 1,100 years of El Nino/La Nina fluctuations. Photo by Paul Krusic
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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