Brian Barton
Peat is a highly pollutant fuel that is even more damaging than coal in terms of global warming. Its combustion releases large amounts of carbon, especially methane, into the atmosphere, contributing to climate change. Peatland fires are a significant source of air pollution, emitting smoke haze pollutants, particulate matter, and toxic gases. Additionally, peatlands have recorded industrial pollution for centuries, with metal and metalloid (TMM) pollution dating back to the Roman Period in Europe. Climate change is expected to increase fire frequency and severity, enhancing the risk of peat fires releasing legacy TMMs. Furthermore, activities on peatlands, such as overgrazing, peat extraction, and afforestation, can negatively impact water quality and biodiversity.
| Characteristics | Values |
|---|---|
| Peat as a pollutant | Peat is the most damaging fuel in terms of global warming. |
| Peat fires are a significant source of air pollution and are associated with harmful impacts on human health and the environment. | |
| Peat fires contribute to the emission of smoke haze pollutants, which contain particulate matter and various toxic and non-toxic gases. | |
| Peat destruction releases vast amounts of carbon, particularly methane, into the atmosphere. | |
| Peatlands are vulnerable to nutrient pollution, which can lead to a loss of species biodiversity. | |
| Peat extraction and overgrazing can have detrimental effects on water quality and aquatic biodiversity. | |
| Climate change impact | Climate change is expected to increase the frequency, severity, and area of peat fires, enhancing the risk of pollutant release. |
| Warmer and drier conditions due to climate change may increase the occurrence and intensity of peatland fires. | |
| Climate change-induced drying may decrease carbon accumulation rates in peatlands, impacting their ability to sequester pollutants. |
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What You'll Learn
Peat fires and air pollution
Peat is a fuel source that is worse for global warming than coal. It has a lower calorific value than coal, generating less energy per tonne when burned, yet it produces higher carbon dioxide emissions per unit. The destruction of peat bogs releases vast amounts of carbon, especially methane, into the atmosphere.
Peat fires contribute to air pollution, which causes almost 6.5 million deaths annually. The smoke from peat fires contains large amounts of carbon dioxide and other greenhouse gases. Additionally, peat fires release mercury into the air at a rate 15 times greater than other types of wildfires. The particulate matter (PM2.5) produced by these fires is capable of entering the human lungs and bloodstream.
Indonesia has been affected by seasonal peat fires for decades, with the fires generating more carbon dioxide on certain days than the average daily emissions in the United States. The air pollution from these fires has also impacted neighbouring countries, including the rest of Southeast Asia. In 2019, the extreme Indonesian peatland fires resulted in very poor air quality, with toxic fine particulate matter suspended in the air for long periods due to the absence of rain. This polluted air, locally termed "haze", affected 43 million people, hospitalizing 550,000, and costing Indonesia US$16 billion in economic losses.
Canada has also experienced peatland fires, with estimates suggesting that these fires emit about 6 teragrams (million metric tons) of carbon annually, contributing significantly to national carbon emissions. Warmer temperatures are increasing the frequency and severity of drought conditions, leaving peatlands more vulnerable to fires. As peatlands burn at a greater rate or depth, fires in the boreal region could contribute even more to national carbon emissions.
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Peat as a fuel source
Peat is a fuel source that is created from partially decomposed plant material in an oxygen-poor and water-saturated environment, such as a bog. It has been used for electricity generation and residential heating in Ireland, contributing to about 3.4 million tonnes of emissions in 2016. However, peat is considered the most damaging fuel in terms of global warming, even worse than coal. Its combustion produces higher CO2 emissions per unit of energy generated and has a lower calorific value. As a result, Ireland has committed to phasing out peat use by 2030.
The burning of peatlands, particularly in Indonesia, has raised significant concerns about air pollution and its harmful impacts on human health and the environment. Peatland fires emit large amounts of smoke haze pollutants, including fine and coarse particulate matter and various toxic and non-toxic gases. These fires are often started by farmers for land clearing or by companies for plantation establishment and can be challenging to control, especially during dry seasons.
In addition to air pollution, peat fires also contribute to the release of legacy metal and metalloid (TMM) pollution. Peatlands have recorded industrial pollution for centuries, with TMM pollution, mainly lead, dating back to the Roman Period in Europe. The risk of TMM release from peat fires is expected to increase due to climate change, which will lead to warmer and drier conditions, making fires more frequent and severe. However, the level of risk associated with TMM release remains uncertain, highlighting the need for further research and effective mitigation strategies.
Furthermore, nutrient pollution affects peatlands, particularly fen habitats. Intensive land management, runoff from cattle grazing, and activities like overgrazing, peat extraction, and afforestation can all contribute to water pollution and biodiversity loss. Eutrophication, or the enrichment of water bodies with nutrients like nitrogen, phosphorus, and potassium, leads to vegetation changes and a loss of species richness. Conservation efforts, such as Ireland's Peatland Conservation Action Plan 2020, aim to address these issues and preserve peatland biodiversity.
Overall, while peat has been used as a fuel source, its environmental and health impacts are significant. The transition away from peat as a fuel source is crucial to reducing emissions and mitigating the negative consequences of its use.
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Peat extraction and biodiversity
Peat extraction is a significant cause of peatland degradation. It results in the drainage of peat bogs, which often leads to the invasion of scrub. This, in turn, has several negative consequences, such as changes in nutrient dynamics and forest composition, disruption of hydrological function, biodiversity loss, and an increase in greenhouse gas emissions.
For instance, in Peninsula Malaysia, Sumatra, and Borneo, it was estimated that 0.14 GtC (comparable to 0.513 Gt CO2) was lost due to the conversion of peatlands. Similarly, in Alberta, Canada, where peatlands cover about 21% of the landscape, the carbon in peatlands is significantly higher than that in agricultural soils, lake sediments, and forests.
The negative impacts of peat extraction can be mitigated through various after-use options, such as abandonment, restoration, and replacement. Restoration measures, in particular, have been shown to speed up vegetation recolonization, reduce GHG emissions, and decrease negative impacts on water systems. However, there is a lack of comprehensive research comparing the environmental and social impacts of these after-use options, especially regarding social impacts, downstream hydrology, and long-term monitoring of GHG fluxes.
In recognition of the environmental and sustainability issues associated with peat extraction, some countries have committed to phasing out its use. For example, Bord na Móna in Ireland has committed to getting out of peat by 2030 and closing bogs by 2025. This decision is expected to have a significant impact on Ireland's emissions, as peat was responsible for 3.4 million tonnes of emissions in the country during 2016.
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Peatlands and climate change
Peat is partially decomposed plant material, which forms when plant matter is deposited in an oxygen-poor and water-saturated environment such as a bog. Peatlands are a type of wetland that provides indispensable nature-based solutions for adapting to and mitigating the effects of climate change. They are the largest natural terrestrial carbon store, containing about 25% of global soil carbon, which is more than twice the amount stored in the world's forests.
Peatlands regulate water flows, minimise the risk of flooding and drought, and prevent seawater intrusion. They lower ambient temperatures in surrounding areas, providing refuge from extreme heat, and are less likely to burn during wildfires, thus preserving air quality. Peatlands also preserve important ecological and archaeological information, such as pollen records and human artefacts.
However, the destruction of peat bogs by burning, draining, and degrading emits significant amounts of CO2 and methane, a potent greenhouse gas. In some regions, up to 80% of peatlands have been damaged, and emissions from drained peatlands are estimated at 1.9 gigatonnes of CO2 annually, equivalent to about 5% of global anthropogenic greenhouse gas emissions. Climate change can also accelerate disturbances that destabilise peatland carbon stocks, such as the thawing of permafrost, which can quickly release large amounts of carbon. Warmer temperatures are also changing wildfire regimes, with droughts making peatlands more susceptible to burning.
Peatland restoration and conservation are vital in the transition to a zero-carbon society. Rewetting and restoring peatlands reduce soil carbon losses, lower wildfire susceptibility, and decrease greenhouse gas emissions. Peatlands should be included in intergovernmental agreements relating to climate change, and better peatland management can be a crucial climate change mitigation strategy.
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Peatland pollution modelling
Peat, the most damaging fuel in terms of global warming, is formed when plant material is deposited in an oxygen-poor and water-saturated environment. Its destruction releases vast amounts of carbon, especially methane, into the atmosphere. Peatlands cover only 3–4% of the Earth’s surface but store nearly 30% of the global soil carbon stock. This significant carbon store is under threat as peatlands continue to be degraded at alarming rates around the world.
Modelling peatland dynamics and habitat conditions is essential for understanding and mitigating the impacts of peatland degradation. Several process-based models have been developed to simulate peatland dynamics, including exchanges of energy and mass (water, carbon, and nitrogen). These models fall into four main categories: terrestrial ecosystem models, hydrological models, land surface models, and eco-hydrological models. Remote sensing and satellite data have also been utilised to map and monitor peatland conditions, providing valuable insights into the geographical distribution of peatland degradation.
One successful example of peatland modelling is the construction of a MODIS-based model for Scotland. This model, with a kappa statistic of 0.8151-0.82, accurately predicted the probability of peatland sites being in favourable condition. The derived map of predicted peatland condition was corroborated by data from restoration sites, non-peatland land cover, and previous vegetation survey data. This modelling approach is well-suited for larger areas of peatland with low fragmentation.
To optimise peatland modelling efforts, standardisation and coordination of data exchange, and model calibration/validation are crucial. By leveraging existing models and streamlining the model selection process, we can avoid redundancy and fully exploit the strengths of available tools. Additionally, higher-resolution satellite data sources can enhance the accuracy of modelling smaller peatland areas.
In conclusion, peatland pollution modelling is a complex but essential undertaking to address the degradation of this vital carbon sink. By employing a range of modelling techniques and improving data collection and sharing, we can better understand and protect peatlands, contributing to global efforts to reduce carbon emissions and mitigate climate change.
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Frequently asked questions
Peat is the most damaging fuel in terms of global warming, even worse than coal. It produces high CO2 emissions and its destruction releases large amounts of carbon, especially methane, into the atmosphere.
Peat is partially decomposed plant material that forms in oxygen-poor, water-saturated environments like bogs. Burning, draining, and degrading peat bogs releases significant amounts of CO2 into the atmosphere. Peatland fires are a significant source of air pollution, emitting smoke haze pollutants containing particulate matter and various toxic and non-toxic gases.
Smoke from peatland fires has been associated with harmful effects on human health and the environment. During peatland fires, smoke can cover large areas, affecting not just local communities but also neighbouring regions. The specific short-term and long-term health risks associated with exposure to peatland fire pollution are not yet fully understood due to limited data.
There is a growing recognition of the need to phase out the use of peat. For example, Bord na Móna in Ireland has committed to getting out of peat by 2030 and closing bogs by 2025. Additionally, there is a research focus on developing peatland models to better understand the factors that drive peat flammability and the risks associated with peat fire pollution, including the release of legacy metal and metalloid pollution.
