NASA has issued research that shows the Earth is getting darker. The sun is the primary reason why life is possible on our planet. Along with other cosmic formations, if only one thing were misplaced by a couple of meters, it would be enough to make everything change for us, and humans wouldn’t probably get to see the light of day, ever. Now, scientists are worried about the fact that there is less sunlight reaching our planet, and things could look very different if things continue this way.
What is going on with Earth: It’s getting darker and colder
The less sunlight hits the Earth, the less heat we have. This is not breaking news, but it is one of the most important features in the relationship our planet has with the big star. Their interactions are intense, and while the carbon in the atmosphere is contributing to changes in the temperature of the planet as the years go by, something else might be the reason why we are not getting as much sunlight as before.
Even though it gets darker at night, it doesn’t mean the sun is not acting. In fact, if it weren’t, almost every country that is not located close to the North and South Pole would have an icy look – even those in the equator line, where the heat is more intense. If it continues like this, the impact could be significant, and the lives of billions of people would change.
NASA has an answer: Scientists break down what is happening
Scientists say Earth is reflecting less sunlight, and the effect is strongest in the Northern Hemisphere. The finding, published Monday in the Proceedings of the National Academy of Sciences, breaks a long-standing balance in the planet’s reflectivity, or albedo. For decades, clouds seemed to level things out. They circulated in a way that balanced the obvious differences between hemispheres, such as land distribution, so both reflected about the same amount of light.
Norman Loeb, who heads the research at NASA’s Langley Research Center, noted that scientists have always seen this symmetry in the data but never had a solid theory to explain it. His team’s review of 24 years of satellite records from the CERES program, run by NASA and NOAA, showed the balance had finally broken.
Time to rethink our acts: Some things we can’t control
Both hemispheres are dimming, but the Northern Hemisphere is doing so much more quickly. That shift challenges the long-held assumption that hemispheric symmetry is a built-in feature of Earth’s climate. Loeb and his colleagues believe the changes are linked to a mix of factors: climate change, the decline of aerosol pollution, and major natural events.
Melting ice and snow, which are highly reflective, are reducing albedo in the north as glaciers and ice sheets retreat. Meanwhile, stricter regulations on aerosols have cleared the skies over much of the Northern Hemisphere, leading to fewer clouds and less reflection. In the south, however, recent disasters have temporarily brightened the skies.
Natural disasters in Australia contributed to how the Earth looks now
The Australian bushfires that happened in 2019-2020 and the Hunga Tonga volcanic eruption of January 2022 pumped large amounts of aerosols into the atmosphere, creating reflective clouds that countered some of the darkening seen elsewhere.
Loeb highlighted that the biggest surprise was the lack of compensation from northern cloud systems. If hemispheric symmetry were a fixed rule of the climate, the clouds should have balanced out the loss in reflectivity — but they didn’t. The discovery was only possible because of CERES, which has provided over twenty years of detailed satellite records of Earth’s radiation budget.