Peatlands factsheet
Q. What are peatlands?
A. Peatlands are carbon-rich wetlands which occupy 3% of the global land surface and 12% of UK land area.
• The waterlogged conditions prevent plant material from fully
decomposing and ‘peat’ soil is formed by the partially decayedmaterial, which builds up slowly.
•Natural vegetation in Northern Hemisphere peatlands ismainly mosses, sedges and shrubs, while in the tropics they arenaturally forested.

•In the UK, there are 3 types of peatland:o Blanket bog – large areas of peat found largely in uplands fed primarily by rainfallo Raised bog – localised domes of peat in lowland areas fed primarily by rainfall
o Fens (pictured) – fed by mineral-rich groundwater and river water, as well as rainfall

Q: Why are peatlands important?
A: Peatlands are among the most carbon-rich ecosystems on Earth. In a natural condition, peatlands have anet cooling effect on climate, reduce flood risk, and support biodiversity. Healthy peatlands can reduce floodrisk by slowing the flow of water from the uplands, and by providing floodplain storage in the lowlands.
They also provide important nesting and feeding grounds for many wading birds, as well as important
habitats for rare insects and plants. Due to the unique flora and fauna they support, and their global rarity,
blanket bogs have sometimes been referred to as the ‘rainforests’ of the UK.

Q. How do healthy peatlands mitigate climate change?
A. Healthy peatlands capture CO2 from the atmosphere through photosynthesis. Because the plants thatgrow on peatlands do not fully decompose under wet conditions, they do not release carbon which wouldotherwise be returned to the atmosphere as CO2.
Peatlands store vast quantities of carbon – ‘locking in’ an estimated 3.2 billion tonnes in the UK alone, andwhere peat continues to form this helps to offset the effects of human activities (such as fossil fuel burning)that are raising CO2 levels in the atmosphere, leading to climate change. However, overall, peatlands in theUK and around the world are estimated to be a net source of greenhouse gas emissions to the atmosphere,
as opposed to a net sink, due to the way they have been managed now and in the past.

Q. Why is peatland exploited by humans?
A. Although wetlands are naturally productive systems, most of the food and fibre crops that support humanlife require dry conditions. As a results, farmers and foresters have drained large areas of upland and lowland
peat throughout the UK. Lowland ‘fen’ peat has been particularly affected because it is very fertile whendrained, supporting the production of valuable arable and horticultural crops.
For example, peat soils in the East Anglian fens are highly valuable for agriculture, producing a large
proportion of the UK’s salad crops and one-third of England’s fresh vegetables, supporting a food chain worth
more than £3 billion a year. Large areas of upland bog have also been drained for conifer forestry andlivestock grazing, while other areas are rotationally burned as part of grouse shooting estates. Peat has also
been extracted (mined) from many lowland raised bogs around the UK and Ireland for use as a growing
medium by the horticulture industry and by gardeners.

Q. What is the impact of peatland degradation?
A. Around 80% of UK peatland has been affected due to human activities
which are:•Draining the soil so it is not waterlogged, in order to make it suitablefor crop and tree growth leads to the decomposition of plant materialand soil shrinkage. This releases carbon into the air and is thereby asource of CO2 emissions into the atmosphere. While it takes 1,000years for 1m of peat to build up, drainage means the land surface
reduces an average of 1cm to 2 cm per year through subsidence due topeat oxidation.
Drainage also means large areas of lowland peat, notably in the East
Anglian Fens, are now below sea level and at risk from flooding•

The creation of ditches to enable drainage also provides channels for the rapid flow of water, which may
increase flood risk downstream•Drying out the peat soil allows shrubby vegetation to grow, and makes the land more vulnerable tosevere wildfires. Fire (caused by managed burning, accidental spread or arson) also produces CO2; forexample a major wildfire on peat in the Scottish Flow Country is thought to have doubled Scotland’s
greenhouse gas emissions during the six days it was burning

Q. How much peatland is there in the UK?
A: Peatland covers around 3 million hectares in this country:•

22% of the total peatland area remains in a near-natural condition, comprising undrained bogs and fens•

41% of the UK peat area remains under semi-natural peatland vegetation, but has been affected byhuman activities including drainage, burn-management, livestock grazing and the cutting of peat for fuel•16% is covered by woodland, the majority of which is drained conifer plantation•

15% is occupied by agricultural cropland and grassland, mainly in lowland regions of England such as
the Fens, Norfolk Broads, Manchester Mosses and Somerset Levels•Industrial peat extraction for horticultural use occupies 0.15% of UK peatland, mostly on lowland raisedbogs

Q: How many greenhouse gas emissions are UK peatlands producing?
A: The first comprehensive research into emissions from peatland areas in the UK was carried out in a study
led by the UK Centre for Ecology & Hydrology and the James Hutton Institute. It estimated the overall, net,
greenhouse gas (GHG) emissions from peatlands could exceed the equivalent of around 20 million tonnes ofCO2 each year. This revised calculation adds around 4% to the UK’s previously estimated total annual GHGemissions. Globally, scientists estimate peatlands are emitting the equivalent of 1-2 billion tonnes of CO2,
which is around 2-4% of all human greenhouse gas emissions. A large proportion of these emissions arebeing produced by the tropical peatlands of Southeast Asia.

Q. How will degrading peatlands affect farming in the long term?
A. The degradation of peatlands has a negative impact on soil health over time, affecting the long-term
viability of agriculture in those areas. Peat subsidence due to drainage also increases the need for expensive
pumping to maintain conditions suitable for crop growth, and increases the risk of flooding. Raising waterlevels could benefit farmers by extending the productive lifetime of the soil, as well as reducing both CO2emissions and flood risk.

Q. Is there a willingness among government agencies and NGOs to reduce emissions?
A. Based on research and monitoring by UKCEH and other organisations, the UK Government, NGOs,scientists and the agricultural sector increasingly recognise the environmental impacts and costs ofdegrading peatlands. Reducing GHGs from peatlands is key to the UK’s ambition of reaching net zero
emissions by 2050. Peat restoration is national government policy in England, Scotland, Wales and Northern
Ireland. The Office for National Statistics estimates fully restoring the UK’s degraded peatlands could cost
between £8bn-£22bn over the next 100 years, but would save £109bn in terms of reduced carbon emissions.

Q. What action is being taken to restore and manage peatlands in the UK?
A. Many NGOs, private sector organisations and individual land-managers across the UK are now carrying out
peatland restoration. Measures to raise water levels include blocking up ditches, adjusting drainage systems
and removing trees from peatland areas.
In England, a new Peat Strategy is part of Defra’s 25 Year Environment Plan. This includes £10m funding forrestoration schemes in Northumberland, Greater Manchester, North York Moors, East Anglia and Dartmoor.
Most of the UK’s peat is in Scotland, and the Scottish Government has been funding peatland restoration
schemes for several years as part of its National Peatland Plan. This includes Scottish Natural Heritage’s
Peatland Action initiative which has restored 19,000 hectares since 2012. In 2019, the Scottish Government
announced a total of £14m of funding to repair and restore peatlands.
The Welsh and Northern Ireland governments have also backed peatland restoration schemes.
Q. How is the UK Centre for Ecology & Hydrology supporting these activities?
A. The UK Centre for Ecology & Hydrology (UKCEH) is involved inresearch into how peatland can be managed sustainably, in order toprovide economically viable lower-emission agricultural
management options for peatland areas.
More specifically, UKCEH is:•operating the UK’s largest network of peatland greenhouse gas
emissions monitoring sites, as well as long-term ecological, water
quality and hydrological monitoring sites•

leading a project for Defra measuring CO2 emissions from areasof land with different water levels on a trial site in East Anglia
over a two-year period•a partner in the Water Works project in the Cambridgeshire Fens. This two-year trial, run by theregional Wildlife Trust, is testing how well certain crops grow in wet conditions•

contributing to the Welsh Government’s Sustainable Management Scheme programme for peatlands,
developing new ground-based and satellite-based monitoring tools to support large-scale peat conditionassessment, and to ensure investment in restoration is appropriately targeted and effective•

working with regional water companies, in Wales, Scotland and England, to support effective
management of peatlands in water supply catchments; helping to reduce costs for consumers and toensure the UK’s water supply infrastructure is resilient against climate change.

•working with the Committee on Climate Change and others to help identify and reduce the risk ofclimate change or land-management leading to ‘tipping points’ of peat degradation in future, and to
identify the role of peatland restoration in meeting net zero greenhouse gas emissions by 2050.

•providing the data used by the UK Government to report on its national greenhouse gas emissions underinternational conventions such as the Kyoto Protocol, and is helping the Government to meet its
commitments to include all peatlands in the UK’s national emissions inventory by 2021.

Q. Why is there a particular problem with peatland
emissions in Southeast Asia?
A. The issue of peatland degradation is most acute in thetropical peatlands of Southeast Asia, primarily in the islands ofBorneo and Sumatra, where over two-thirds of all peat swamp
forests have been cleared and drained since 1990.
These habitats are home to iconic fauna such as Sumatran tigers
and Bornean orangutans, and the large-scale deforestation in
the region plus hunting has led to significant decline in their
populations, with species classified as ‘Critically Endangered‘.
Most of this land has been converted to industrial palm oil andpulpwood plantations. Fire is often used as a tool to clear land for cultivation, and these fires often run out ofcontrol into adjacent forests. These fires produce toxic smog across Indonesia, Malaysia and Singapore’,contributing to dangerous levels of particulate matter harmful to human health
The degradation of peatlands through drainage and burning, plus the fires themselves, produce significant
CO2 emissions every year. The IPCC estimates tropical peatland cultivation generates the equivalent of 440
million tonnes of CO2 per year, with peat fires generating on average a further 200 million tonnes.
UKCEH is engaged in projects that support regional governments, companies and individual farmers indeveloping more environmentally sustainable peatland management. This includes a major project for theUK Space Agency to develop satellite-based tools for large-scale peatland monitoring.
UKCEH also undertakes field-based research aimed at quantifying and helping to reduce greenhouse gas
emissions from smallholder-managed peatlands, plus enhance livelihoods through improved crop
management and more efficient fertiliser use. The institute also provides advice to large plantationcompanies and agencies in the region on measures to reduce their greenhouse gas emissions and meet theirsustainability goals.