Tree ring research was a young field in 1975 when Ed Cook (above, in Nepal) and Gordon Jacoby founded the Tree Ring Lab at Lamont. The Lab would become a world leader in tree ring sampling and analysis and a source of technology and training for dendrochronologists around the world. 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