CO2 Found to Cool Earth's Upper Atmosphere Amid Climate Change
CO2 Found to Cool Earth's Upper Atmosphere Amid Climate Change
US · Published May 15, 2026
A new study by researchers at Columbia University has uncovered the mechanism by which carbon dioxide (CO2) cools the Earth's upper atmosphere, even as it contributes to warming at the surface.
Published in Nature Geoscience, the research explains how CO2 interacts with specific wavelengths of infrared light, causing the stratosphere to shed heat into space.
This phenomenon, first predicted in the 1960s, has led to a cooling of the stratosphere by approximately 2°C since the mid-1980s.

Why It's Important?

The cooling of the stratosphere, while not directly harmful to human life, has significant implications for the Earth's climate system. It intensifies the greenhouse effect by reducing the amount of heat radiated into space, thereby exacerbating surface-level warming. This feedback loop could accelerate climate change impacts such as rising sea levels, extreme weather events, and ecosystem disruptions. The study also underscores the importance of understanding atmospheric dynamics to predict and mitigate these risks effectively.

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