lakes
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Ancient Pollen Points to Mega-Droughts in California Thousands of Years Ago
Ancient pollen spores that were in the air when mammoths roamed Southern California are providing new insights into historic droughts in the region, including how a series of mega droughts 25,500 to 27,500 years ago changed the ecological landscape.
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Protecting Our Waterways: The Waterkeeper Alliance
At any given time, there are dedicated environmentalists around the U.S. working to protect our waterways.These “keepers” are all members of the Waterkeeper Alliance (WKA), an organization of over 200 keepers globally, defending their communities’ rights to clean water.
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
