In 1989, Gordon Jacoby and Rosanne D’Arrigo (above), the Lab’s first PhD student and now associate director of the Division of Biology and Paleo-Environment, published a landmark reconstruction of temperatures dating back 300 years across North America. The records show the effects of global warming. Photo courtesy of Gordon Jacoby
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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