you asked3
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You Asked: How Can Students Make a Difference on Climate Change?
Two students weigh in on how they’re taking action and why it matters.
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You Asked: What Caused Climate Change Before the Industrial Revolution?
A paleoclimatologist walks us through some of the natural causes of climate change — and why it’s important to take action on human-caused warming.
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You Asked: Can the Great Green Wall Stop the Sahara From Expanding?
A climate scientist answers readers’ questions about an initiative that would plant a vast wall of trees to combat the effects of climate change.
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You Asked: Does Caring About Plastic Distract From Climate Change?
Short answer: Why not both?
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You Asked: What Are My Clean Energy Options in New York?
Because most NYC apartments don’t have the space for a solar panel array.
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You Asked: How Destructive Are the Amazon Rainforest Fires? Can They Be Stopped?
An Earth Institute adjunct tackles reader questions about the record-breaking fires in Brazil.
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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.
AGU25, the premier Earth and space science conference, takes place December 15-19, 2025 in New Orleans, Louisiana. This year’s theme—Where Science Connects Us—puts in focus how science depends on connection, from the lab to the field to the ballot box. Once again, Lamont-Doherty Earth Observatory and Columbia Climate School scientists, experts, students, and educators are playing an active role, sharing our research and helping shape the future of our planet. #AGU25 Learn More
