Forests, sometimes referred to as the “lungs of the Earth,” are essential for controlling the planet’s climate because they absorb enormous volumes of carbon dioxide. However, scientists have struggled to determine the precise amount of carbon stored by trees and how these stores vary over time. The launch of the European Space Agency’s (ESA) Biomass satellite on April 29, 2025, marked a significant milestone in solving this challenge. Using advanced satellite images, scientists are now able to uncover hidden carbon trends in forest biomass, providing unprecedented insights into the global carbon cycle. This blog explores how satellite imaging technology is changing our understanding of forest biomass and how it relates to climate change mitigation.

The Importance of Forests in the Carbon Cycle

One of the biggest carbon sinks on Earth, forests make up about 31% of the planet’s surface area. Forests are essential for counteracting greenhouse gas emissions because they absorb over 7.6 billion metric tons of carbon dioxide a year, according to NASA. However, this ability is in jeopardy due to human actions like deforestation and climate change. Hidden carbon trends in forest biomass—such as shifts in carbon storage due to forest growth or loss—have been difficult to measure accurately, especially in dense, remote tropical forests like the Amazon, Congo, and Indonesian rainforests, which hold nearly 50% of the carbon stored in global vegetation.

Tree cutting and weighing are two time-consuming and impractical traditional ways of assessing forest biomass for large-scale investigations. Additionally, ground-based measurements are limited in crowded or difficult-to-reach areas. A solution is provided by satellite imagery, which gives researchers reliable, worldwide data that allows them to track hidden carbon trends in forest biomass with previously unheard-of accuracy.

The Biomass Satellite: A Game-Changer in Forest Monitoring

The ESA’s Biomass satellite, launched on April 29, 2025, from Kourou, French Guiana, aboard a Vega-C rocket, is the first of its kind to use a P-band synthetic aperture radar (SAR). This radar, with a wavelength of approximately 70 cm, can penetrate dense forest canopies and clouds, allowing it to measure the woody parts of trees—trunks and large branches—where most carbon is stored. Unlike previous satellites, such as Sentinel-1, which use shorter C-band wavelengths and only capture data from the tops of forests, the Biomass satellite’s P-band radar provides a deeper view, revealing hidden carbon trends in forest biomass.

The satellite orbits Earth at an altitude of 666 km in a sun-synchronous orbit, completing 15 to 16 orbits daily. Over its five-year mission, it will create detailed 3D maps of tropical forests within 17 months and produce new global maps every 9 months thereafter. These maps will quantify carbon stocks and also track changes due to deforestation, forest growth, and climate impacts. The mission’s data is expected to reduce uncertainties in global carbon cycle calculations, providing critical inputs for climate models.

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Advancements in Satellite Data Analysis

The Biomass mission builds on nearly two decades of satellite data from missions like Envisat, Copernicus Sentinel-1, Japan’s ALOS PALSAR, and NASA’s ICESat and GEDI lidar sensors. A newly released dataset, developed as part of ESA’s Climate Change Initiative and led by scientists from Aberystwyth University, integrates these measurements to offer the clearest view yet of hidden carbon trends in forest biomass. Thanks to enhanced algorithms and global cooperation with partners like the Japan Aerospace Exploration Agency, this dataset corrects prior underestimates in carbon-rich regions.

Tropical forests have a significant part in the carbon cycle, as evidenced by the dataset’s findings that they absorb 30% of the world’s CO2. Nevertheless, it also demonstrates that since 2000, deforestation has caused a 12-20% reduction in the amount of forest cover worldwide, returning stored carbon to the sky. Scientists can now more precisely track these trends and pinpoint areas where carbon storage is rising or falling by fusing historical data with real-time observations from the Biomass satellite.

Uncovering Hidden Carbon Trends in Forest Biomass

The ability to peer through dense canopies and clouds is a breakthrough for uncovering hidden carbon trends in forest biomass. The Biomass satellite’s P-band radar uses a CT scan-like approach, analyzing “slices” of forest to create layered views of woody biomass. Previously thought to be impossible, this technique enables scientists to determine the weight of 1.5 trillion trees worldwide. For example, within six months of launch, the mission is anticipated to produce its first forest carbon maps, which will serve as baseline data for monitoring changes over time.

The effect of deforestation on carbon storage is one important trend that satellite imagery has revealed. In the Amazon rainforest, which stores approximately 150 billion metric tons of carbon, illegal logging and agricultural expansion have reduced forest biomass by 15-30% over the past decade. In the same way, wildfires are causing boreal forests in Canada and Russia, which account for 30% of the world’s total forest area, to lose carbon. In 2023, fires released an extra 640 million metric tons of CO2. These results highlight how urgent it is to preserve forests in order to preserve their ability to sequester carbon.

Also Read: How Reforestation Helps Reduce Carbon Emissions

Implications for Climate Change Mitigation

The data from the Biomass satellite has far-reaching implications for climate change mitigation. By quantifying hidden carbon trends in forest biomass, scientists can better inform policies like REDD+ (Reducing Emissions from Deforestation and Forest Degradation), a UN initiative aimed at incentivizing forest conservation.

Policymakers can establish reasonable goals for cutting emissions and reforesting areas when carbon stocks are measured accurately. For instance, since 2015, Ethiopia’s reforestation initiatives have expanded the country’s forest cover by 4.5 percent, storing 2.76 billion tons of CO2 yearly. The data from the Biomass mission will also help climate models by giving accurate estimates of carbon fluxes, or the flow of carbon from forests to the atmosphere.

For forecasting how forests will react to increasing temperatures and shifting precipitation patterns, this is essential. The model that suggests that if global temperatures increase by more than 2°C by 2050, tropical forests may lose some of their capacity to store carbon can be updated using the Biomass satellite data.

Conclusion

Our knowledge of trees’ contribution to the carbon cycle is being revolutionized by satellite imagery, spearheaded by the ESA’s Biomass project. This method provides vital information for addressing climate change by revealing hidden carbon patterns in forest biomass. The Biomass satellite will enable people, scientists, and politicians to protect these essential ecosystems for a sustainable future as it continues its five-year voyage.

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