What Are Peat Fires?
Peat is a unique organic soil layer built up over thousands of years from partially decomposed plant matter. Unlike typical forest fires that blaze on the surface, peat fires penetrate deep underground — sometimes several meters — and smolder at low temperatures for months or even years with no visible flame.
Surface Forest Fire
- Visible to eyes and satellites
- Burns for days to weeks
- Ends when surface fuel is exhausted
- Can be fought from the air with water
- Releases carbon from surface biomass
Underground Peat Fire
- INVISIBLE — no visible flame
- Smolders for months to years
- Burns 3+ meters deep underground
- Cannot be fought from the air
- Releases millennia of stored organic carbon
Why Satellites Miss Them
Thermal Satellites Are Blind
MODIS and VIIRS satellites detect surface hot spots. Underground fires don't create surface heat — they smolder at 300–600°C beneath the soil.
Smoldering for Years
After a forest fire ends, peat below continues burning underground for years — steadily releasing CO₂ with no visible signs above ground.
3+ Meters Deep
The thickest boreal peat deposits can be 10 meters deep or more. Underground fires can consume this entire peat column, releasing carbon accumulated over 10,000 years.
Lund University: 14× Underestimation
A landmark 2026 study from Lund University (Sweden) analyzed the country's major 2018 wildfires — which burned over 100,000 hectares — and compared actual emissions against predictions from state-of-the-art climate models.
The results were shocking: emissions from underground organic soil (smoldering peat) were up to 14 times higher than what models predicted. At a global scale, the study estimates that underground organic soil carbon emissions are underestimated by up to 50%.
This has profound implications for all IPCC climate models — every projection of future climate change may be systematically underestimating a massive carbon source.
The Carbon Bomb Concept
Boreal forests store more carbon than currently exists in the entire Earth's atmosphere. This is the planet's largest terrestrial carbon store — and it is being activated by global warming.
Why This Is Called a 'Carbon Bomb'
Scientists use the term 'carbon bomb' to describe large carbon reservoirs capable of releasing massive emissions if triggered. Boreal peatlands are the world's largest carbon bomb because:
- Store 600+ Gt carbon (more than in the atmosphere)
- Increasingly vulnerable to fire due to climate change
- Once ignited underground, cannot be extinguished
- Continue releasing carbon years after fire ends
If just 10% of boreal peat carbon were released, it would equal decades of global industrial emissions — and would push us irreversibly past the Paris Agreement's 1.5°C threshold.
Key Peatland Regions at Risk
Boreal peatlands stretch from North America across Europe to Siberia. Together with tropical peat in Southeast Asia, they form the planet's most critical carbon storage network.
World's largest peatland complex. Rapid permafrost thaw accelerating fire risk.
2023 record season burned ~15,000 km² of peatlands on Taiga Plains alone.
Sweden 2018 fires — subject of Lund University 2026 research showing 14× underestimation.
Warming 2× faster than global average. Increasing fire return intervals disrupting peat accumulation.
Tropical peatlands drained for agriculture. 2015 fires released more CO₂ than entire US economy in 6 weeks.
What Current Models Are Missing
Current IPCC climate models estimate wildfire emissions primarily from satellite data and surface observations. Because underground peat combustion is invisible to these methods, it is either ignored or estimated using fixed coefficients that don't reflect the actual depth and duration of burning.
The Lund 2026 research demonstrates this means our best models for 1.5°C pathways may be using inflated carbon budgets — too optimistic about how much CO₂ we can still emit.
How Climate Change Is Fueling the Crisis
100,000 hectares burned — later found to have released 14× more carbon than models predicted.
Extreme fires torched 19M+ hectares. Peat soils in alpine regions smoldered for weeks after surface fires.
Record-breaking fires in Yakutia. Permafrost peat ignited across remote taiga.
18.4M hectares burned — the worst in recorded history. ~15,000 km² of peatlands on Taiga Plains alone.
World Meteorological Organization confirms 2024 as hottest year. Arctic warming accelerating peat fire risk.
Peer-reviewed findings: Sweden 2018 peat emissions underestimated by up to 14×. Global underground organic soil emissions underestimated by up to 50%.
WMO 2024: The World Meteorological Organization confirmed 2024 as the warmest year ever recorded. The Arctic is warming 4× faster than the global average, drying out peatlands and setting conditions for the next record-breaking fire season.
What Can Be Done?
While the challenge is immense, concrete strategies exist to better monitor, protect, and accurately account for peatland carbon.
SAR Satellite Monitoring
Synthetic Aperture Radar can detect ground subsidence from underground burning — invisible to optical cameras.
Drone Sensor Networks
Low-altitude drones equipped with CO₂, CH₄ and thermal sensors can map smoldering peat across large areas.
Peatland Rewetting
Restoring water tables in drained peatlands is the most effective known strategy to prevent carbon loss.
Revised Carbon Accounting
IPCC and national GHG inventories must update methodologies to include underground peat combustion.
International Peatland Treaty
A dedicated UN framework protecting the world's largest remaining peatland complexes from drainage and fire.
Deep Soil Carbon Mapping
Ground-penetrating surveys to quantify peat depth and carbon stocks — currently only ~30% of boreal peat is mapped.
Read more about global environmental protection efforts: High Seas Treaty 2026 — protecting oceans and the global carbon cycle
What This Means for Carbon Accounting & Paris
The Paris Agreement requires each country to report its carbon emissions and absorption under IPCC standards. But if those standards miss 50% of organic soil emissions, the entire global carbon accounting system is built on fundamentally flawed data.
Countries with large peatland areas — Canada, Russia, Sweden, Indonesia — may be inadvertently under-reporting their national emissions, distorting the picture of global climate target progress.
Must be updated to include underground peat combustion and multi-year post-fire emissions.
NDC commitments may be miscalculated due to inaccurate baseline data.
Carbon credits from forest protection (REDD+) need to price in peat fire risk.
The AR7 cycle must integrate Lund 2026 findings into carbon budget estimates.
▸ If peat fire emissions are underestimated 14x, global carbon budgets need recalculation -- directly impacting the 1.5C target
Sources & Research
- Climate models may be missing massive carbon emissions from boreal wildfires — ScienceDaily, March 2026
- Underground peat fires drive hidden carbon emissions in Swedish wildfires — Muser Press, March 2026
- Burned permafrost peatlands release carbon for years after wildfires — University of Alberta — Folio, March 2026
- We may be underestimating the true carbon cost of northern wildfires — Phys.org, February 2026
- The role of boreal fires in climate change — 4 key graphics — Woodwell Climate Research Center, 2024
Related: Sea Level Rise 2026 · Arctic Sea Ice Collapse 2026
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