Our expert says: Although carbon dioxide levels have been much higher in the past, they generally increased slowly, giving plants and animals time to adapt. When the rate of climate change was staggeringly fast, like today, there were big problems.

Our expert says: It’s better than adding another piece of plastic to the problem.

A recent study provides a rough timeline, but there’s still time to save them if we cut our carbon emissions.

Columbia scientists, journalists, and content creators answer some of the most frequently asked questions about climate communication.

CO2 molecules make up only a small percentage of the atmosphere, but their impact on our climate is huge. The reason comes down to physics and chemistry.

Volcanologist Einat Lev tackles reader questions and explains how more monitoring of volcanoes could save lives.

Paleoecologist Kevin Uno explains how humans have been adapting to changes in climate for thousands of years, and how we need to adapt now to protect our species’ future.

Climate scientist Radley Horton tackles questions about climate tipping points, and how we can tip the scales in a safer direction.

Climate scientist Gisela Winckler explains the link between climate science and solutions, and shares some of her research adventures.

If CO2 is heavier than oxygen, why doesn’t it stay near the ground? The short answer: Earth’s atmosphere isn’t like a sealed bottle of wine.