Climate change is not only being measured through rising temperatures. Another worrying indicator that scientists are observing is the change in the brightness of the Earth: the planet is gradually losing its natural ability to reflect the Sun's rays back into space.

This phenomenon is known as Earth's albedo decline – a process that shows that the planet's surface is becoming less reflective and absorbing more solar energy, contributing to the acceleration of global warming. Data collected by NASA's CERES satellites, which have been monitoring Earth's energy balance since the late 1990s, show that the planet is storing an increasing amount of heat coming from the Sun, rather than returning it to space.

Scientists explain that several factors are influencing this change: melting ice and snow, changes in cloud formation and reductions in atmospheric aerosols related to pollution. Ice and snow have a high ability to reflect sunlight, while darker surfaces such as oceans and land absorb more energy. With the reduction of glaciers and sea ice, the planet is losing some of its natural “mirrors” that help maintain climate balance.

This process creates a vicious climate cycle: warming causes ice to melt, decreasing reflective surfaces lead to more energy absorption, and this leads to further warming.

The Earth is accumulating more energy

One of the main indicators of climate change is the Earth's energy imbalance. Under normal conditions, the planet must balance the energy it receives from the Sun with the energy it emits back into space through infrared radiation.

But recent measurements show that more energy is being trapped in the Earth system, causing temperatures to rise. These results are also supported by data from the international Argo program, a network of thousands of ocean-based measuring devices that monitor temperature and changes in seawater. According to scientists, more than 90% of the excess energy accumulated by the planet ends up in the oceans.

One of the most complex aspects of this phenomenon is related to the fight against air pollution. In recent decades, many countries, including Europe, the United States and China, have significantly reduced industrial emissions and pollution from transport. This development has brought great benefits to human health, but it has also had an unexpected effect on the climate. Some polluting particles in the atmosphere, especially aerosols, have the ability to reflect part of the solar radiation and create a temporary cooling effect.

As they decrease, part of this “reflective shield” has weakened, allowing more solar energy to reach and be absorbed by the Earth’s surface. According to researchers, the reduction in aerosols may have significantly contributed to the planet’s increasing energy imbalance over the past two decades. Scientists emphasize that this change is not visible to the naked eye, but satellite measurements show that the Earth is changing in a way that could directly affect the pace of global warming.