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What Does the Changing Climate Mean for Food Security?

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Best-selling author and climate activist Bill McKibben recently joined Columbia Mailman professor Lew Ziska for a conversation about the threat of climate change on global food security. The conversation was moderated by Alfredo Morabia, editor of the American Journal of Public Health and professor of epidemiology.

McKibben said climate-related disasters are already making it harder to grow food, contributing to an uptick in hunger around the world—a sharp reversal after decades of nutrition gains. “The most basic human question is ‘what’s for dinner?’ or even more basically, ‘is there going to be any?’” he said. “That’s a question we thought we had begun to lick in the 20th century. It’s now a question that is being deeply reopened.”

Read more and watch the video here.

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Collage of Turkiye beach scene and Columbia University Campus with text: UN Climate Change Conference COP31, Antalya, Turkiye, Nov 9-20, 2026

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

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