When we think of European forests, the collective imagination evokes lush landscapes, shady ancient beech forests, endless expanses of Scandinavian conifers, or the Mediterranean maquis diving into the sea. For decades we have lull ourselves in the reassuring illusion that, unlike tropical rainforests battered by deforestation to make room for agriculture, the forests of the Old Continent were safe, even expanding territorially thanks to the abandonment of rural and mountainous areas. However, the quantitative expansion of tree cover has masked a silent and inexorable qualitative decline for a long time. Today, in 2026, science confronts us with a stark and unequivocal reality: our forests are under siege.
Sounding the alarm is historical research just published on the pages of the renowned scientific journal Science. The study, the result of a vast international collaboration that saw the researchers of the Italian National Research Council (CNR) on the front lines, does not limit itself to photographing the present but projects a menacing shadow on our medium and long-term future. The main conclusion of the research is a warning that leaves no room for sweetened interpretations: due to the climate changes underway, damage to the European forest heritage caused by fires and the proliferation of pests is destined to double by the end of the twenty-first century.
The End of the Green Illusion: From Carbon Sinks to Emission Sources
To understand the gravity of this projection, it is necessary to frame the vital role that forests play in the continental and global climate balance. European woodlands currently absorb about 10% of all greenhouse gas emissions produced by European Union countries. They are our most important green infrastructure, a gigantic natural “carbon sink” working tirelessly and for free to mitigate the impact of human activities.
However, this ecosystem is based on a thermal and hydrological balance that global rising temperatures have brutally broken. The increase in climate “stressors” (abnormal heatwaves and prolonged droughts) weakens the natural defenses of trees. When a forest dies on a large scale, burned by flames or decimated by pests, it not only stops absorbing carbon dioxide but releases into the atmosphere all the carbon it had stored over the preceding decades or centuries, through combustion or the process of deadwood decomposition. It is the most dangerous paradox of climate change: Earth’s defense mechanism risks transforming into an accelerator of collapse.
The Vicious Cycle: Drought, Xylophagous Insects, and Mega-Fires
The research published in Science highlights with pitiless precision how the various threats do not act in isolation but feed each other in a vicious cycle (a positive feedback loop) with devastating consequences. The two great protagonists of this destructive escalation are xylophagous insects (specifically scolitid beetles, such as the European spruce bark beetle) and forest fires.
The mechanism is as fascinating from a biological perspective as it is lethal. Under normal conditions, a healthy conifer attacked by a scolitid beetle reacts by producing abundant resin, a sticky substance that literally “drowns” the pest or repels it, sealing the entry holes in the trunk. But to produce resin, the tree desperately needs water. European summers, increasingly scorching and devoid of precipitation, subject plants to extreme water stress. Without water, there is no resin. The weakened and thirsty trees become helpless prey for swarms of millions of beetles that dig galleries under the bark, interrupting lymphatic flow and killing century-old specimens within a matter of weeks.
And it is here that the second destructive element comes into play. Millions of dead trees, standing or wind-felled (so-called “windthrows” caused by increasingly violent storms), transform into an immense deposit of highly flammable fuel, perfectly dry and ready to ignite at the minimum trigger, whether lightning or, much more frequently, human negligence. When fire breaks out in these conditions, it is no longer the classic controllable forest fire, but “mega-fires” are generated: firestorms that exceed the extinguishing capacity of any forest corps, capable of creating their own local weather systems and spreading ashes hundreds of kilometers away.
The Study’s Numbers: An Unprecedented Predictive Analysis
What makes the study by CNR and international partners a milestone in ecological research is its impressive methodological robustness. The researchers did not base themselves on simple linear models but applied advanced machine learning algorithms to an endless database that collects satellite observation and ground surveys from the last forty years across Europe, from Swedish boreal forests down to the holm oak forests of Andalusia and our own peninsula.
These historical data on “forest disturbances” (a scientific term grouping fires, windthrows, and insect epidemics) were then cross-referenced with the main climate emission scenarios elaborated by the IPCC (Intergovernmental Panel on Climate Change). The results are unequivocal: if we do not drastically and immediately reverse the global curve of climate-altering gas emissions, the forest biomass lost annually due to these combined factors will double by the year 2100.
We are talking about a potential loss of tens of millions of cubic meters of wood every single year, with a peak mortality that will be recorded not only in the already vulnerable Mediterranean basin but will aggressively shift northwards, striking the heart of the Central European forest industry in Germany, Austria, Czech Republic, and Poland.
The Collapse of Monoculture: The End of a Management Model
If climate change is the trigger for this ecological bomb, the Science study boldly highlights how humans have meticulously set the explosive. The current vulnerability of European forests is largely the offspring of a profoundly flawed management model, massively adopted since the post-war period.
To maximize timber production for industrial use, for decades the creation of monospecific (composed of only one tree species, typically Norway spruce or pine) and even-aged (with trees all of the same age and height) artificial forests has been privileged. These immense industrial plantations, while highly profitable in the short term, have proven to be a true ecological disaster in the long run.
A forest composed of only one species is an “all-you-can-eat buffet” for pests. When the bark beetle attacks a spruce, if it has around only other spruces of the same age and with the same vulnerabilities, the infestation propagates at exponential speed, without encountering natural barriers. Furthermore, the identical root systems compete for water in the same soil layer, aggravating the effects of drought. The collapse of Norway spruce forests in Central Europe in recent years is the funeral monument to this industrial approach, a warning that nature does not allow itself to be standardized without presenting, sooner or later, the bill.
Economic and Social Consequences
The doubling of forest damage predicted by the study is not “only” an ecological tragedy, but an economic and social tsunami. The European forest sector and the wood-based bioeconomy provide employment for millions of people, from mountain sawmills down to the furniture, paper, and sustainable construction industries.
Waves of tree mortality create an initial shock where the market is flooded with salvage logging (often of low and depreciated quality) cut urgently to prevent pest proliferation. This price collapse, which bankrupts small forest enterprises, is inevitably followed by a period of drastic shortage of raw materials, putting entire production chains at risk and pushing Europe to import timber from countries with much lower environmental standards.
Without forgetting the devastating impact on local mountain communities. Destroyed forests no longer offer protection against landslides and avalanches, no longer filter drinking water, lose their inestimable tourism and recreational value, and put at risk the cultural identity of countless European and Italian valleys.
The New Paradigm: Biodiversity and Proactive Adaptation
Faced with such an alarming picture, the study by the CNR, published in Science, does not limit itself to sounding the alarm but points out the narrow and necessary path for the survival of our ecosystems. We must definitively abandon the extractive and industrial logic of monoculture and embrace an approach based on diversity and resilience, a model technically defined as “close-to-nature forest management.”
This means actively encouraging the creation of mixed forests, mixing conifers and deciduous trees (such as beeches, oaks, maples), which possess different root systems and varying natural resistances to pathogens. If a pest attacks a spruce in a mixed forest, the epidemic stops because it encounters the beech, which acts as a natural “fire-break” sanitary barrier. It means maintaining trees of different ages and heights in the forest, creating a complex structure that better resists windstorms.
It also means making courageous choices, such as “assisted migration”: planting today, in our mountains, tree species coming from slightly warmer and drier latitudes (like oaks from Southern Europe) that will be genetically better suited to withstand the climate we will have in fifty years. The forest of the future will not be the same as that of the past, and we must guide this transition with targeted silvicultural interventions, thinning forests that are too dense to reduce competition for water and the fuel load in case of fire.
Conclusion: The Forest as Critical Infrastructure
The results of this international research force us to stop looking at forests simply as a picturesque backdrop for Sunday outings or as a timber quarry. Woodlands are the basic infrastructure of our survival on the planet. Rethinking their management in light of climate challenges is a strategic imperative of national and European security. We cannot limit ourselves to hoping that nature finds a new balance on its own in useful times for our society; the doubling of damage predicted by the CNR warns us that the time of passive observation is over. Only through smart, diversified, and scientifically supported forestry can we guarantee that the protective shadow of our trees continues to cover even future generations.
