Restoring Wetlands for Climate Resilience and Sustainability

Wetlands are among the most productive ecosystems on Earth, yet they are disappearing at an alarming rate. Since the beginning of the last century, approximately 64% of the world’s wetlands have vanished. This loss is particularly troubling because wetlands provide essential services that directly affect human wellbeing and the planet’s climate system. Restoring degraded wetlands has emerged as one of the most effective strategies for building climate resilience, sequestering carbon, protecting biodiversity, and reducing disaster risks. Understanding why wetland restoration matters-and how it can be achieved-is crucial for anyone concerned about our environmental future.

Why wetland restoration is critical for climate resilience 🔗

Wetlands occupy only 5-8% of the world’s land area, yet they contribute 20-30% of the global carbon pool. This remarkable carbon storage capacity makes wetlands invaluable in the fight against climate change. When wetlands are drained or degraded, the carbon accumulated over centuries or even millennia is released into the atmosphere as carbon dioxide and methane, accelerating global warming.

The U.S. Geological Survey estimates that terrestrial wetlands in the continental United States alone store 13.5 billion metric tons of carbon, with freshwater inland wetlands holding nearly ten times more carbon than tidal coastal wetlands. Peatlands in forested regions account for nearly half of all wetland carbon in the United States.

Beyond carbon storage, restored wetlands provide critical climate adaptation benefits. They act as natural sponges, absorbing excess rainfall and reducing downstream flooding. Coastal wetlands buffer communities against storm surges and erosion. In a warming world where extreme weather events are becoming more frequent, these natural defenses become increasingly valuable.

The carbon sequestration powerhouse 🔗

Wetland soils are oxygen-poor environments that slow decomposition, allowing organic matter to accumulate over time. This process creates highly concentrated carbon reserves that can persist for thousands of years. Peatlands, while covering just 3% of the Earth’s land surface, store twice as much carbon as all the world’s forests combined. This makes protecting and restoring peatlands particularly important for climate mitigation.

Coastal wetlands, including salt marshes, mangroves, and seagrass meadows, store what scientists call “blue carbon.” Mangrove forests store 3-4 times more carbon in their soils than tropical forest soils, with this carbon remaining stable for 400-770 years. The anaerobic conditions in these waterlogged environments preserve organic carbon that might otherwise decompose and return to the atmosphere.

Key restoration practices for different wetland types 🔗

Effective wetland restoration requires approaches tailored to specific ecosystem types. Three major categories of wetlands-mangroves, peatlands, and floodplains-each demand distinct restoration techniques.

Mangrove reforestation 🔗

Mangroves grow in tropical and subtropical coastal zones, bridging the transition between land and sea. They store carbon at concentrations more than five times higher than any other wetland ecosystem. Restoration of these coastal forests involves several approaches.

Site selection is crucial. Successful projects identify areas where natural mangrove regeneration has been blocked by altered hydrology or land use, then remove these barriers to allow recovery. In some cases, active planting is necessary. Research shows that planting mangroves close to high water levels and configuring plantations in multiple patches produces better outcomes for carbon storage.

Successful mangrove restoration projects in countries like Vietnam, Indonesia, and Sri Lanka demonstrate that restored mangroves can provide significant coastal protection benefits within 5-7 years, with carbon sequestration benefits accumulating over decades. Mangrove belts of only 100 meters width have been shown to reduce wave heights by up to 66%, making them excellent tools for climate adaptation.

Peatland rewetting 🔗

Peatlands form over thousands of years as plant matter accumulates in waterlogged conditions. When drained for agriculture or other uses, the peat oxidizes and releases its stored carbon. Peatlands have a carbon storage capacity 10 to 13 times greater than other ecosystems, making their restoration particularly valuable.

Rewetting-restoring high water tables-is the fundamental step in peatland restoration. This involves blocking drainage ditches and canals to raise water levels. Research in Indonesia found that building canal blocks on palm oil plantations can reduce emissions by up to 30% compared to business as usual.

A successfully rewetted peatland can shift from emitting 10-20 tons of CO₂ equivalent per hectare annually to becoming a net carbon sink within a decade. In tropical peatlands, rewetting projects in South Sumatra have demonstrated that canal blocking successfully raises water tables and reduces carbon emissions while promoting forest regrowth.

Floodplain restoration and water management 🔗

Floodplain wetlands form alongside rivers that periodically overflow their banks. Many of these systems have been disconnected from their rivers by levees and other flood control structures. Restoration approaches include levee setbacks or removals, allowing rivers to reconnect with their natural floodplains, and controlled flooding that mimics natural flood pulses when complete levee removal is not feasible.

Riparian buffer restoration-reestablishing native vegetation along waterways-stabilizes banks and filters runoff. These approaches restore natural flood mitigation services while creating habitat and improving water quality. The result is landscapes that can absorb floodwaters rather than channeling them downstream to cause greater damage.

Co-benefits of wetland restoration 🔗

While climate benefits drive much of the current interest in wetland restoration, these ecosystems provide far more than carbon storage. Healthy, well-preserved coastal wetlands provide efficient carbon sequestration and long-term storage with minimal methane emissions, but they also deliver essential services that support human wellbeing and biodiversity.

Water security and quality 🔗

Wetlands act as natural water treatment systems, filtering pollutants and sediments from water as it moves through the landscape. They regulate water flow, storing excess water during wet periods and releasing it slowly during dry periods. This natural regulation helps maintain water supplies and reduces both flood and drought impacts.

Wetlands serve as natural flood defenses, acting as giant sponges that soak up water, filter pollutants from freshwater, and prevent sediment from reaching the sea. For communities dependent on reliable water supplies, restored wetlands can be essential infrastructure.

Disaster risk reduction 🔗

Coastal wetlands provide natural buffers against storms and tsunamis. Mangrove forests reduce wave energy, protecting inland areas from storm surge damage. Salt marshes absorb wave action and reduce erosion. These protective services become more valuable as climate change increases the frequency and intensity of coastal storms.

Inland wetlands similarly reduce flood risks by absorbing and slowing the movement of water across watersheds. In many regions, restoring wetland flood storage capacity is proving more cost-effective than building or maintaining artificial flood control infrastructure.

Biodiversity and ecosystem services 🔗

Over 5,700 species rely on mangroves, highlighting their importance for ecosystem connectivity and biodiversity conservation. Wetlands provide critical habitat for migratory birds, fish spawning grounds, and countless other species.

Coastal wetlands support commercial fisheries, with mangroves and other coastal habitats serving as nursery areas for commercially important fish and shellfish species. Restoring these habitats can boost fish populations and support fishing communities. Additionally, wetlands provide recreational opportunities like birdwatching, fishing, and nature tourism that benefit local economies.

Contributing to sustainable development goals 🔗

Wetland restoration directly supports multiple Sustainable Development Goals. The Ramsar Convention contributes to SDGs including poverty eradication (Goal 1), ending hunger and promoting sustainable agriculture (Goal 2), ensuring water and sanitation (Goal 6), combating climate change (Goal 13), and protecting terrestrial ecosystems (Goal 15).

Wise use, management, and restoration of wetlands help build opportunities for improving livelihoods. Wetland degradation affects livelihoods and exacerbates poverty, particularly among marginalized and vulnerable sections of society. Restoration offers a pathway to reverse these impacts while delivering climate benefits.

Global initiatives and successful case studies 🔗

International cooperation and coordinated action are essential for wetland restoration at scale. Several major initiatives and conventions provide frameworks for countries to work together.

The Ramsar Convention 🔗

The Ramsar Convention, signed in 1971, was one of the first international conservation agreements, promoting global wise use of wetlands. It has three primary objectives: national designation and management of wetlands of international importance, general wise use of wetlands, and international cooperation. As of recent counts, the Ramsar Site Network includes over 2,391 sites covering 2.5 million square kilometers.

The convention provides guidance on wetland restoration through its principles and guidelines, emphasizing that restoration projects should recognize multiple wetland functions. At the 2025 Ramsar COP15 in Zimbabwe, parties adopted a resolution on wetland restoration, committing to develop or improve national legislation and policies for restoring degraded freshwater ecosystems.

The Global Mangrove Alliance 🔗

In 2017, five leading conservation organizations created the Global Mangrove Alliance, a network focused on promoting, coordinating, and scaling mangrove conservation and restoration. The Alliance now includes over 100 member organizations across more than 30 countries and 11 National Chapters.

The Alliance established three science-based targets for 2030: halt anthropogenic mangrove loss, initiate restoration in half of restorable mangrove areas lost since 1996, and increase protection from 42% to 80% of remaining mangroves. Recent stocktaking indicates that members have collectively restored 36,000 hectares with ongoing projects potentially restoring an additional 202,000 hectares.

The Mangrove Breakthrough initiative aims to mobilize $4 billion to protect 15 million hectares of mangroves by 2030, with support from 50 governments. This unprecedented commitment demonstrates growing recognition of mangroves’ importance for climate and biodiversity.

The Global Peatlands Initiative 🔗

Recognizing that drained peatlands emit roughly 5% of global anthropogenic greenhouse gas emissions, the Global Peatlands Initiative brings together UN agencies, governments, and NGOs to support peatland conservation and restoration. The initiative facilitates knowledge sharing and supports countries in better managing and restoring their peatlands.

Countries can reduce emissions by rewetting drained peatlands and implementing alternative forms of use such as paludiculture-wet peatland agriculture that maintains high water tables while producing crops. Indonesia, for example, has committed to restore 2 million hectares of peatlands by 2030 as part of its climate commitments.

Case studies of successful restoration 🔗

Real-world examples demonstrate that wetland restoration works. In south-eastern Australia, restoration of Pick Swamp began in 2007, recovering a nationally threatened wetland ecological community of karst springs and alkaline fens. The project illustrates how community involvement and sustained action can transform degraded landscapes.

In Scotland, reintroducing beavers has restored natural water cycles, improving biodiversity and reducing flood risks. This example shows how restoring key wildlife species can help restore entire wetland ecosystems.

Southeast Asia holds almost 50,000 square kilometers of mangrove cover-about one-third of all mangroves globally. Conservation efforts in Indonesia’s peatlands and mangroves demonstrate both the challenges and opportunities of large-scale restoration in tropical regions. The Bio-rights program in Indonesia provides small loans to communities for mangrove conservation and restoration, generating alternative livelihoods while restoring ecosystems.

Moving forward with wetland restoration 🔗

Despite the clear benefits of wetland restoration, significant challenges remain. Funding gaps, competing land use pressures, and the long timeframes required for full ecosystem recovery all present obstacles. However, growing recognition of wetlands’ value for climate mitigation and adaptation is driving increased investment and policy attention.

As of 2023, 97 countries have included coastal and marine ecosystems in their Nationally Determined Contributions under the Paris Agreement, and 61 countries have included conservation or restoration of blue carbon ecosystems as mitigation or adaptation measures. This policy momentum creates opportunities for scaling up restoration efforts.

Success requires setting clear, well-stated goals that recognize wetlands’ multiple functions. Restoration projects work best when they integrate local community knowledge, secure appropriate long-term funding, and adopt adaptive management approaches that allow learning and adjustment over time. With the right approaches, wetland restoration offers one of our most powerful tools for building a more resilient and sustainable future.

What do you think? How might wetland restoration efforts in your region contribute to climate resilience? What barriers do you see to scaling up these natural climate solutions, and how might they be overcome?

References

1. https://www.sciencedirect.com/science/article/abs/pii/S0013935125001410
2. https://www.usgs.gov/centers/whcmsc/news/learn-how-wetlands-can-naturally-help-climate-change-impacts
3. https://bwsr.state.mn.us/carbon-sequestration-wetlands
4. https://iucn.org/news/forests/201701/mangrove-restoration-offering-two-one-solutions-climate-change
5. https://forestsnews.cifor.org/74046/scientists-detail-restorative-mangrove-and-peatland-management-strategies
6. https://www.nature.com/articles/s43247-025-02401-2
7. https://www.ykan.or.id/en/program/terrestrial-program/peatland-conservation/
8. https://www.ykan.or.id/en/publications/articles/press-release/tlf-peatland-restoration/
9. https://www.nature.com/articles/s41598-024-60462-3
10. https://www.ecologic.eu/19807
11. https://www.nature.org/en-us/about-us/where-we-work/asia-pacific/new-zealand/stories-in-new-zealand/blue-carbon/
12. https://www.globallandscapesforum.org/publication/the-state-of-the-worlds-mangroves-2024/
13. https://sustainabledevelopment.un.org/index.php?menu=3170&nr=821&page=view&type=30022
14. https://www.frontiersin.org/journals/environmental-science/articles/10.3389/fenvs.2021.643367/full
15. https://iucn.org/news/202507/ramsar-cop15-concludes-strengthened-global-commitment-wetland-restoration-and-inclusive
16. https://tos.org/oceanography/article/capacity-building-and-connecting-practitioners-through-the-global-mangrove-alliance
17. https://www.mangrovealliance.org/news/mangrove-breakthrough-unprecedented-4-billion-initiative-launched-to-protect-15-million-hectares-of-mangroves-by-2030/
18. https://www.wetlands.org/news/countries-can-strengthen-climate-plans-2020-peatland-mangrove-targets/
19. https://www.dcceew.gov.au/water/wetlands/publications/wetlands-australia/july-2022/wetlands-action-people-and-nature
20. https://www.decadeonrestoration.org/new-report-ramsar-convention-wetlands-how-we-and-our-wetlands-rely-wild-animals
21. https://www.wetlands.org/publication/new-state-of-the-worlds-mangroves-report-2024-underscores-critical-linkages-to-biodiversity-climate-and-communities/
22. https://iucn.org/news/202407/new-state-worlds-mangroves-report-underscores-critical-links-biodiversity-climate-and