You Asked4
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You Asked: If CO2 Is Only 0.04% of the Atmosphere, How Does it Drive Global Warming?
Short answer: A little bit goes a long way.
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You Asked About River Salinity and Water Pollution
A Columbia Water Center staffer answers questions about salinization and water pollution.
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You Asked: Do Plastic Bag Bans Work in Developing Nations?
An environmental lawyer tells us about the impact of anti-plastic bag legislation across the world.
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You Asked: How Can I Find Out the Carbon Footprints of Different Foods?
We look at research from the Earth Institute and beyond to answer questions about the impacts of beef, soy, and more.
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You Asked: What Determines the Oxygen and CO2 Levels in Our Atmosphere?
An Earth Institute climate researcher breaks down why our atmosphere is the way it is, how it’s changed over time, and what the future may hold.
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You Asked: What Are the Most Eco-Friendly Garbage Bags?
An Earth Institute staffer gives advice on alternative trash bag options and how reduce your need for trash bags altogether.
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You Asked: Why Do We Know More About the Moon Than Our Own Oceans?
An Earth Institute oceanographer answers this deep question from a reader as part of our Earth Month Q&A on Instagram.
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Your Earth Questions, Answered
In celebration of Earth Month and Earth Day, our scientists are tackling reader questions on science and sustainability.
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
