Archive · 25 Dec 2025
Clouds Drive Earth's Growing Heat Imbalance More Than Air Pollution
Scientists found that Earth is getting warmer because it's absorbing more energy than it's releasing.
They thought air pollution was the main reason, but a new study shows that changes in clouds are actually the bigger problem.
Clouds usually reflect sunlight back into space, keeping Earth cool.
But lately, clouds have been less reflective, letting more sunlight in.
This is happening because of natural changes and warming at the Earth's surface.
Air pollution does affect clouds, but its impact isn't as big as previously thought.
In the north, cleaner air lets more sunlight through, while in the south, natural events like wildfires make clouds more reflective.
The study helps us understand what's really causing global warming and how to plan for it better.
Earth's energy imbalance is primarily driven by changes in cloud behavior, not air pollution.
Clouds have become less reflective, allowing more solar energy to reach the Earth's surface.
Aerosols from air pollution have a minimal overall impact on the global energy balance.
Cleaner air in the Northern Hemisphere allows more sunlight to reach the surface, while natural aerosol events in the Southern Hemisphere make clouds more reflective.
Understanding these changes is crucial for improving climate models and making informed policy decisions.
- Who
- Chanyoung Park, lead author of the study and a doctoral student in the Department of Atmospheric Sciences at the Rosenstiel School
- What
- A study revealing that changes in clouds are the primary driver of Earth's growing heat imbalance, not air pollution
- When
- The study analyzed data from 2003 to 2023
- Where
- The study was published in Science Advances
- Why
- To understand the primary drivers of Earth's growing heat imbalance and improve climate models
- Study Source
- Science Advances
- Study Duration
- Nearly two decades (2003-2023)
- Heat Gain Rate
- Half a watt more energy per square meter each decade
- Primary Driver of Imbalance
- Changes in cloud behavior
- Secondary Factor
- Natural climate variability
- Aerosol Impact
- Minimal overall impact on global energy balance
- Lead Author
- Chanyoung Park