Sacrificing Old Boreal Forests for Profit Is Rewriting Earth’s Ecosystems

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Boreal forests, stretching across the northern parts of the world, are among Earth’s most vital ecosystems. Often referred to as “taiga,” these forests form a nearly continuous belt of coniferous trees—primarily spruce, pine, and fir—across Alaska, Canada, Scandinavia, and Russia.

Characterized by cold climates, short growing seasons, and nutrient-poor soils, boreal forests are uniquely adapted to survive harsh conditions. These vast stretches of trees are not just clusters of timber—they are ancient, living systems that have shaped global climates, supported wildlife, and sustained human cultures for centuries.

However, a groundbreaking study from 2022 reveals a troubling reality: old, untouched boreal forests are disappearing rapidly, replaced by uniform tree plantations. This transformation is happening quietly, without proper tracking or understanding, and the consequences could reshape our planet’s future.

The Importance of Old Boreal Forests

Old-growth boreal forests, defined as forests that have developed over centuries without significant human disturbance, are ecological treasures. Unlike younger forests or tree farms, these ancient woodlands have complex structures with trees of varying ages, abundant deadwood, and multi-layered canopies.

Over time, they accumulate massive amounts of carbon in their trees, soil, and decaying wood—a process critical for mitigating climate change. Carbon sinks, natural systems that absorb more carbon dioxide than they release, are a key feature of these forests.

Scientific studies show that old boreal forests hold up to twice as much carbon as younger, managed forests.

For example, in Sweden, these ancient forests store around 180 metric tons of carbon per hectare, while replanted forests hold only 90 tons. This makes them indispensable allies in slowing global warming.

Biodiversity thrives in these forests due to their structural complexity. They provide habitats for specialized species that cannot survive elsewhere, such as lichens (symbiotic organisms formed by fungi and algae) that grow only on ancient trees, and beetles that depend on decaying wood for reproduction.

Over 40% of Sweden’s forest-dwelling species rely on old-growth habitats, including birds like the three-toed woodpecker and mammals like the lynx. These forests are also culturally irreplaceable.

Indigenous Sámi communities—an Indigenous group native to northern Scandinavia—depend on lichen-rich old forests to feed their reindeer during harsh winters. Lichens, which grow slowly over decades, serve as a primary winter food source for reindeer. Without these ecosystems, the Sámi’s traditional way of life faces extinction.

Despite their immense value, old boreal forests are poorly protected. In Sweden, only 19% of these forests fall under any form of regulation, and less than 1% are strictly protected in national parks. This lack of safeguards leaves them vulnerable to industrial logging, often hidden from global attention because satellites struggle to distinguish natural forests from plantations.

Study Reveals Rapid Boreal Forest Decline

To understand the scale of forest loss, researchers combined two key datasets from Sweden. The first was a national clear-cut database—a detailed record of nearly a million logged areas mapped since 2003. Clear-cutting, a logging practice where all trees in an area are removed, is common in industrial forestry.

The second dataset came from forest inventory plots—74,288 sites surveyed between 1996 and 2019—which recorded tree ages, species, and forest structures. By analyzing the age of trees in these plots, the team identified forests that had likely never been cut or replanted.

Forests with trees predating 1880 (over 140 years old) were classified as “old uncut forests,” since widespread industrial logging in Sweden began around 1900.

The findings were alarming. Between 2003 and 2019, 19% of all clear-cuts in Sweden occurred in these ancient forests. This translates to a loss rate of 1.4% per year, meaning Sweden’s remaining unprotected old forests could vanish entirely by the 2070s.

Northern Sweden, home to some of the most carbon-rich and biodiverse forests, is experiencing the heaviest logging. Southern regions, meanwhile, have already lost most of their old growth due to deforestation over the past century.

The study also revealed that old forests are being disproportionately targeted. While they make up a small fraction of Sweden’s total forest area, they account for nearly a fifth of recent clear-cuts. This suggests that loggers prioritize older stands, possibly due to their high-quality timber or accessibility.

Logging Threats to Ancient Boreal Ecosystems

The driving force behind this loss is Sweden’s forestry model, known as rotation forestry—a system where forests are clear-cut, replanted, and harvested in cycles of 50 to 100 years.

While efficient for producing timber, this approach replaces complex, naturally regenerated ecosystems with monoculture plantations (large areas planted with a single tree species). These managed forests lack the structural diversity of old-growth habitats—fewer dead trees, simpler canopies, and less undergrowth—resulting in “ecological deserts” for many species.

Government policies play a key role. Sweden’s Forestry Act prioritizes wood production, with recent updates aiming to balance economic and environmental goals. However, enforcement remains weak, and protections for old forests are minimal.

For example, a 2021 analysis found that only 0.95% of Sweden’s old forests are strictly protected in national parks. The rest remain open to logging, despite their ecological and cultural value.

Boreal Deforestation: A Global Climate Threat

The crisis in Sweden is part of a larger pattern across the boreal biome, which spans Canada, Russia, and Scandinavia. In Canada, satellite data shows that 10% of boreal tree cover was lost between 2001 and 2021, much of it in old-growth areas.

A 2020 study in eastern Canada found that 60% of logging targets high-productivity old forests, similar to Sweden’s trends.

Furthermore, in Russia, vast stretches of Siberian boreal forest are being logged—often illegally—to meet global demand for timber.

A major challenge in addressing this issue is the lack of proper monitoring. Global satellite systems, such as those used by organizations like the World Resource Institute, struggle to distinguish between natural forests and plantations.

In boreal regions, where tree species diversity is low, a replanted spruce forest can look nearly identical to an ancient one from space. This makes it easy for governments and companies to overlook the ecological damage caused by replacing old forests with tree farms.

The Hidden Costs of Losing Old Forests

The conversion of old boreal forests to plantations carries severe consequences, many of which are not immediately visible.

1. Carbon Emissions: Clear-cutting releases centuries of stored carbon into the atmosphere. While new plantations absorb CO₂ over time, young trees take decades to match the carbon storage capacity of ancient forests.

For instance, research shows that replanted forests in Sweden require over 100 years to regain the carbon stocks (total carbon stored in trees, soil, and debris) of old-growth ecosystems.

2. Biodiversity Loss: Species adapted to old forests cannot survive in simplified plantations. In Sweden, over 70% of epiphytic lichens—lichens that grow on trees and are critical for nutrient cycling—are found only in old forests.

Similarly, beetles that decompose deadwood decline by 80% in managed forests, disrupting ecosystems and weakening their resilience to pests and diseases.

3. Cultural Impacts: Indigenous communities bear the brunt of this loss. The Sámi people, who have herded reindeer in northern Sweden for millennia, report shrinking grazing lands as lichen-rich forests disappear. “Without these forests, our way of life collapses,” explained a Sámi herder in a 2019 interview.

4. Economic Risks: Monoculture plantations are more vulnerable to climate extremes. In Sweden, spruce plantations suffer 30% higher tree mortality during droughts compared to mixed forests. This threatens long-term timber yields and exposes the forestry industry to financial instability.

Solutions to Protect What Remains And Race Against Time

However, addressing this crisis requires urgent action on multiple fronts.

1. Better Monitoring: Governments must combine satellite data with ground surveys to track forest types accurately. Sweden’s detailed forestry databases, which are publicly available, offer a model for transparency. By sharing such data globally, countries can improve accountability and identify at-risk forests.

2. Stronger Protections: Expanding protected areas is critical. Currently, less than 1% of Sweden’s old forests are strictly protected.

Raising this to 10%—a target aligned with United Nations biodiversity goals—would safeguard key habitats. Involving Indigenous communities in forest management is equally important, as their traditional knowledge can guide sustainable practices.

3. Policy Reforms: Incentivizing alternatives to clear-cutting, such as continuous-cover forestry (selectively harvesting trees while maintaining forest cover), could reduce pressure on old forests.

Sweden’s government, for example, could revise the Forestry Act to prioritize ecosystem health over timber volume. Banning logging in high-conservation-value forests would also help.

4. Global Awareness: Northern countries must address boreal forest loss with the same urgency as tropical deforestation.

Just as replacing rainforests with palm oil plantations sparks international outrage, the destruction of old boreal forests deserves global attention. Researchers urge policymakers to recognize that these ecosystems are not renewable—once lost, they cannot be replaced within our lifetimes.

Furthermore, the study’s projections are stark. If current trends continue, Sweden’s unprotected old forests could vanish by the 2070s. Globally, boreal deforestation risks releasing 3.7 billion metric tons of stored carbon—equivalent to 40% of annual global emissions. The clock is ticking, but there is hope.

Sweden’s detailed datasets prove that tracking forest loss is possible. Public awareness campaigns, like Norway’s 2020 initiative to protect old-growth boreal forests, show that policy changes can follow scientific evidence. By learning from these examples, other nations can take steps to preserve their boreal heritage.

Conclusion

The silent conversion of old boreal forests to plantations is one of the most pressing—and overlooked—environmental challenges of our time. These forests are not just timber factories; they are living systems that sustain life on Earth. The 2022 study by Ahlström and colleagues is a wake-up call, urging governments, corporations, and individuals to rethink how we value and manage forests.

The choices we make today will determine whether boreal forests remain vibrant ecosystems or become relics of the past. As the researchers conclude, “The time to act is now—before the old forests are gone for good.” By prioritizing protection, reforming policies, and raising global awareness, we can ensure these ancient giants endure for generations to come.