Advanced Consortium on Cooperation Conflict and Complexity11
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The Missing Piece in Sustainable Peace
We know very little about what “peace” is (and what it isn’t), the conditions that promote it, the motives that drive people to work for it, how to measure it, and how to build a climate and infrastructure that sustains it. Why? Because we don’t study peace. We study war, violence, aggression and conflict—and peace…
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Why U.S. Politics are Stuck – and a Possible Way Out
In this recent TEDx talk in Miami, Professor Peter T. Coleman, chair of the Advanced Consortium on Cooperation, Conflict, and Complexity (AC4) at The Earth Institute, explains why politics in the United States are more deadlocked and polarized today than they have been since the end of the U.S. Civil War, and what our next…
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
