Nicholas Christie-Blick
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Earth’s “Missing” Billion Years: Study Links the Great Unconformity to Early Tectonics
New findings shed light on a widespread gap in the geologic record, where more than a billion years of Earth’s history appear to have been erased.
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Professor Nicholas Christie-Blick Named 2021 AAAS Fellow
The professor of earth and environmental sciences is one of five Columbia faculty recently recognized by the American Association for the Advancement of Sciences.
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
