European forests, which cover nearly 40% of the EU’s land, have long helped fight climate change by absorbing around 436 million tonnes of CO₂ equivalent each year from 1990 to 2022, about 10% of the region’s human-caused emissions. But a groundbreaking study published in Nature on July 30, 2025, reveals a sharp and worrying decline in this capacity. Titled Securing the forest carbon sink for the European Union’s climate ambition, the study led by Markus Reichstein of the Max Planck Institute shows that European forests are losing their carbon sink power, with a 27% drop between 2010–2014 and 2020–2022. An even steeper decline is observed in 2025. This article answers key questions about this crisis, its drivers, and the way forward.

What is a Carbon Sink? Why are Forests so Crucial?

A carbon sink absorbs more CO₂ than it emits, storing it in plants, soils, or oceans. Forests are among the most effective natural carbon sinks because trees absorb CO₂ during photosynthesis and store it in biomass and soil. In Europe, forest expansion and improved management since the 1950s have helped enhance this role. However, the latest findings show that this vital function is weakening, threatening the EU’s climate action framework.

Source: ocean-climate.org

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Why Do Experts Say European Forests Are Losing Their Carbon Sink Power?

The Nature study shows that average CO₂ absorption by European forests fell from 456.9 million tonnes per year (2010–2014) to just 332.6 million tonnes (2020–2022). That’s a 27% reduction in just a decade. If this trend continues, the EU’s target of 310 million tonnes in net carbon removals by 2030, especially under the Land Use, Land-Use Change and Forestry (LULUCF) sector, will be missed. According to the report, European forests are losing their carbon sink power due to compounding pressures from both nature and human activity.

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What is Causing the Decline in Forest Carbon Sinks?

Multiple, interlinked factors are responsible:

1. Extreme Weather from Climate Change

More frequent and intense heatwaves, droughts, and compound events are reducing tree growth and photosynthesis. Events like the 2003 and 2022 heatwaves significantly weakened forest productivity.

2. Higher Logging Rates

Since 2015, forest harvesting has surged, especially for biomass energy and wood industries, reducing available biomass for carbon storage.

3. Ageing Forests and Limited Reforestation

Older forests grow more slowly. Coupled with low rates of new forest planting, this has led to decreased CO₂ uptake.

4. Natural Disturbances

Since 1950, incidents like wildfires, windthrow, and bark beetle outbreaks have risen sharply. These not only release stored carbon but also degrade forest soils, further weakening the carbon sink.

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How Can Europe Restore Its Forest Carbon Sink?

Here are five recommended strategies to reverse the decline:

• Sustainable Forest Management: Encouraging diverse, uneven-aged forests under the EU’s Nature Restoration Regulation improves both biodiversity and carbon absorption.
• Biodiversity-Based Reforestation: Afforestation projects that prioritize biodiversity can improve forest resilience and expand CO₂ capture.
• Climate-Smart Forestry: Using tree species adapted to future climate conditions can enhance long-term sustainability.
• Integrated Climate and Conservation Policies: Aligning forest, climate, and biodiversity strategies ensures that forests support multiple environmental goals.
• Advanced Monitoring and Research: Better forest observation tools and models can inform evidence-based policymaking.

By acting decisively, the EU can recover some of its forest carbon losses and work towards climate neutrality.

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What Are the Climate Risks If Action Is Delayed?

If the forest carbon sink continues to shrink, the EU’s 2030 and 2050 climate targets will be in jeopardy. The European Climate Law aims to cut net greenhouse gas emissions by 55% by 2030, but the LULUCF sector is now offsetting only 6% of total emissions, falling short of the 8% needed. Without a strong and functioning forest carbon sink, reaching climate neutrality by 2050 becomes highly unlikely. This reality underscores that European forests are losing their carbon sink power, making urgent interventions non-negotiable.

Key Statistics on European Forest Carbon Sink

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FAQ

1. What is a carbon sink?

A natural or artificial system that absorbs more CO₂ from the atmosphere than it emits. Forests, oceans, and soils are common examples.

2. Why are forests key to carbon sequestration?

Forests store carbon in their wood, leaves, and soil, helping to remove CO₂ from the air and slow global warming.

3. Why are experts warning that European forests are losing their carbon sink power?

Climate extremes, deforestation, aging forests, and natural disturbances like pests and wildfires are the main contributors.

4. How does this affect the EU’s climate goals?

It risks undermining the EU’s 2030 and 2050 emission targets, as forests play a significant role in absorbing carbon emissions.

5. What actions can restore the carbon sink?

Solutions include biodiversity-based afforestation, sustainable management, climate-adapted tree planting, policy reform, and better monitoring.

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