In Nepal, the team found 1,200-year-old hemlock trees. To get to this site, Ed Cook (left), Paul Krusic (right) and Brendan Buckley hiked for 13 days, cored trees for five days and then walked back out. Everything they needed, from equipment to food, they had to carry. Photo courtesy of Brendan Buckley
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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