A rapid decline in Earth’s cloud cover is intensifying global warming by allowing more solar radiation to reach the planet’s surface, according to a new NASA-led analysis of satellite observations.
Using over two decades of satellite observations, researchers have found that storm cloud zones in both the tropics and middle latitudes have shrunk significantly by 1.5 to 3 percent per decade over the last 24 years.
The findings point to cloud contraction as the single largest factor behind the Earth’s increased absorption of sunlight in the 21st century.
“This cloud contraction, along with cloud cover decreases at low latitudes, allows more solar radiation to reach the Earth’s surface,” the study’s authors wrote.
“When the contribution of all cloud changes is calculated, the storm cloud contraction is found to be the main contributor to the observed increase of the Earth’s solar absorption during the 21st century.”
The research, published in Geophysical Research Letters, links the reduction in cloud cover to shifting atmospheric wind patterns, the poleward movement of storm systems, and the expansion of the tropics — all well-established hallmarks of a changing climate.
Fewer clouds mean less sunlight is reflected back into space, compounding the warming already driven by greenhouse gas emissions. This amplifying effect could push global temperatures higher, faster than previously projected.
“We’ve long known that changes in atmospheric circulation are affecting clouds,” said Professor Christian Jakob, co-author of the study and a climate modeling expert at Monash University. “For the first time, we now have research showing those shifts are already driving major changes in how much energy the Earth absorbs.”
Jakob called the findings “a wake-up call for urgent climate action,” emphasizing the need for sustained support of climate research. “If you want to understand the climate crisis, and prepare for its impacts, you need this kind of data and this kind of analysis,” he said. “It is important for all of us to realize that our climate does not care what people wish it to be — it only responds to our actions.”
The study suggests that predicting where clouds form — and how much solar radiation they reflect — will be essential for forecasting the speed and intensity of future warming.
Looking ahead, Jakob said climate resilience depends on reframing the issue from “climate change” to “weather change.”
“Our mission is to understand how Australia and the world’s weather is being reshaped by a warming climate,” he said. “It’s not just long-term averages that matter, but how the day-to-day and season-to-season conditions we all rely on are changing.”
The study underscores the urgency of climate action and the importance of international investment in earth observation and climate modeling.
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