Fewer clouds, hotter Earth: How reduced cloud cover is driving global warming

The years 2023 and 2024 have been among the hottest on record. Scientists have investigated the causes of this extreme heat and its implications for the planet, attributing it to several factors.

Now, two recent studies suggest another significant contributor to global warming — a decline in cloud cover.

Fewer clouds

A report by The Washington Post highlights these studies, warning that fewer clouds could trigger a feedback loop, further driving up global temperatures.


This research emerges as some scientists predict that Earth may soon surpass 1.5°C above pre-industrial levels, a critical threshold set by the Paris Agreement — a global climate treaty aimed at limiting long-term temperature increases.

Also Read: Elon Musk’s X sees drop in ad revenue despite Apple and other brands returning

What do the studies reveal?

Clouds play a major role in regulating Earth's climate. They act as a blanket, reflecting infrared radiation back to the planet's surface while also bouncing sunlight away, helping to keep temperatures cooler. Low-altitude cumulus clouds have a cooling effect, whereas higher-altitude cirrus clouds trap heat, contributing to warming.

A study by the University of Colorado indicates that low-altitude cloud cover has declined, potentially leading to significant consequences for the planet.

Meanwhile, research by NASA finds that some of the cloudiest regions on Earth have shrunk over the past two decades. This reduction diminishes Earth's ability to reflect sunlight, intensifying warming.

According to the study, cloud cover in three key zones — the Equator and the mid-latitudes of both hemispheres — has decreased by 1.5% per decade.

What could be the impact?

The decline in cloud cover may create a feedback loop, making it harder for wet clouds to form. This would result in rising temperatures, with potentially severe consequences for ecosystems. Scientists acknowledge that the precise effects of reduced cloud cover remain difficult to predict, but they warn that Earth's ability to reflect heat will be compromised, leading to greater heat retention.

Also Read : Elon Musk’s robotaxi vision: Could Tesla and Uber join forces? Uber CEO weighs in

This could impact various sectors, from agriculture — affecting crop yields — to energy consumption, placing countries at higher risk of extreme heat events.

FAQs

1. Have any global warming records been broken in 2025?
Yes, January 2025 was the warmest January on record.

2. What could be causing low cloud cover?
Some researchers suggest that decreasing air pollution is making it harder for water to cling to particulate matter and form clouds. Others believe it is part of a climate feedback loop.