Blue Carbon: The Ocean's Hidden Climate Champion
Image Source: Greeneration

Blue Carbon: The Ocean's Hidden Climate Champion

CIFI Labs Jonathan Garcia Amine Echtati Danilo de Sousa Nhantumbo Erik Valiquette, CCLP Jennifer Loudon Arzu Toren Chris Sunderman

Understanding Blue Carbon

The conservation and restoration of blue carbon ecosystems are essential, not only for the climate benefits they offer but also for the protection of biodiversity and the services they provide to coastal communities. However, conservation efforts require substantial financial investment.

The Verified Carbon Standard (VCS) Program and similar initiatives offer a way to incentivize the protection of these critical ecosystems through carbon finance. By assigning a monetary value to the carbon stored in these ecosystems, the VCS Program enables organizations, businesses, and governments to invest in blue carbon projects. These investments can fund conservation and restoration activities, creating a financial incentive to preserve these vital ecosystems.

Through carbon credits, entities can offset their carbon footprint by investing in projects that conserve or restore blue carbon ecosystems. This not only helps mitigate climate change but also supports biodiversity conservation and the livelihoods of local communities that depend on these ecosystems.

For blue carbon to be part of the broader climate solution, several steps are necessary:

  • Increased Awareness and Understanding: There needs to be greater awareness of the importance of blue carbon ecosystems and the roles they play in climate mitigation and adaptation.

  • Scaling Up Conservation Efforts: Enhanced global efforts and financing mechanisms are required to protect and restore these ecosystems.

  • Robust Monitoring and Verification: Effective management and conservation strategies depend on robust monitoring and verification methods to ensure the integrity of carbon sequestration and storage.

  • Policy Support: Governments and international bodies must integrate blue carbon strategies into climate policies and commitments, creating frameworks that encourage conservation and sustainable use of coastal and marine ecosystems.

Blue carbon represents a critical yet underutilized component of the global fight against climate change. By increasing investment in and attention to these ecosystems, there is a significant opportunity not only to reduce CO2 emissions but also to protect the planet's biodiversity and support the resilience of coastal communities against climate change impacts.

Verra is a prominent organization that certifies environmental and social standards, including those related to carbon offset projects. Within the context of coastal and tidal blue carbon ecosystems—critical areas for carbon sequestration and storage—Verra has developed methodologies that allow for the quantification, verification, and issuance of carbon credits for projects that conserve and restore these vital habitats. Let's delve into the specifics of these methodologies and how they facilitate the conservation and restoration of blue carbon ecosystems.

Conservation and Restoration: REDD+ Methodology Framework (REDD+MF) (VM0007)

The REDD+ Methodology Framework (VM0007) is traditionally associated with reducing emissions from deforestation and forest degradation, as well as conserving, sustainably managing forests, and enhancing forest carbon stocks in developing countries. However, its principles and frameworks can also be applied to mangroves and other coastal and tidal wetlands that store significant amounts of carbon in both their biomass and the soil.

Application in Coastal and Tidal Blue Carbon Ecosystems:

  • Conservation Projects: This methodology can be applied to projects aimed at preventing the deforestation or degradation of mangrove forests, which are often threatened by agricultural expansion, aquaculture, and infrastructure development. By conserving these ecosystems, projects can avoid the release of stored carbon into the atmosphere.
  • Restoration Projects: Although primarily focused on conservation, the REDD+MF can also support activities related to the restoration of degraded mangrove and other wetland areas. Restoring these ecosystems not only sequesters atmospheric CO2 as the vegetation grows back but also reinstates their function as vital carbon sinks.

Restoration: Methodology for Tidal Wetland and Seagrass Restoration (VM0033)

The Methodology for Tidal Wetland and Seagrass Restoration (VM0033) specifically addresses the restoration of these critical ecosystems. Restoration activities can include re-establishing tidal flows to degraded wetlands, replanting mangroves where they have been removed, and seeding or planting seagrass in areas where it has been lost.

Key components are:

  • Quantifying Carbon Benefits: This methodology provides a detailed framework for quantifying the carbon sequestered through restoration activities. It takes into account both the biomass and the soil as carbon storage mediums.
  • Monitoring and Verification: VM0033 outlines strict monitoring and verification procedures to ensure that the carbon benefits claimed by a project are real, measurable, and verifiable over time.

Verified Carbon Units (VCUs)

Projects applying these methodologies can generate Verified Carbon Units (VCUs), each representing one metric ton of CO2 equivalent that has been either reduced or removed from the atmosphere. These VCUs can then be sold in the voluntary carbon market, providing a financial incentive for entities to invest in the conservation and restoration of blue carbon ecosystems.

The sale of VCUs provides a financial return for project developers, making it economically viable to conserve and restore these ecosystems. By generating and selling VCUs, projects contribute to global climate mitigation efforts, as buyers of the credits can use them to offset their own emissions.

The methodologies provided by Verra for coastal and tidal blue carbon ecosystems are crucial tools in the global fight against climate change. They not only offer a way to quantify and verify the carbon sequestration benefits of conservation and restoration projects but also create a mechanism for funding these activities through the sale of carbon credits. As the awareness and importance of blue carbon continue to grow, these methodologies will play a vital role in leveraging carbon finance to protect and restore these invaluable ecosystems.

Verra’s commitment to innovation in the realm of coastal and tidal blue carbon is evident through its formation of the Blue Carbon Working Group and the development of the Wetland Restoration and Conservation (WRC) Requirements. These initiatives demonstrate a comprehensive approach to addressing climate change by leveraging the unique capabilities of coastal and tidal ecosystems to sequester and store carbon. Let’s explore these innovations in more detail.

Blue Carbon Working Group

In early 2020, Verra established the Blue Carbon Working Group with a mission to explore the multifaceted challenges and opportunities associated with the restoration and conservation of coastal wetland ecosystems. This strategic move underscores the importance Verra places on blue carbon ecosystems as vital components in the fight against climate change.

The working group is tasked with identifying the barriers to and potential for increasing blue carbon projects within the framework of the Verra Carbon Standard (VCS) Program. This includes assessing methodological, technical, and policy-related challenges. One of the group’s key roles is to offer guidance on how the VCS and its supporting methodologies can be optimized to better incentivize and accommodate blue carbon conservation and restoration activities. This involves suggesting improvements to existing methodologies and potentially developing new ones tailored to blue carbon projects.

Wetland Restoration and Conservation (WRC) Requirements

The WRC Requirements, developed by Verra in collaboration with a technical working group, represent a significant advancement in the accounting and crediting of carbon sequestration through wetland restoration and conservation activities. These requirements are part of Verra's broader strategy to integrate blue carbon projects into the VCS Program.

While specifically beneficial for blue carbon ecosystems like mangroves, seagrasses, and tidal marshes, the WRC Requirements are applicable to all types of wetland ecosystems. This inclusive approach ensures that a wide array of wetland restoration and conservation projects can qualify for carbon credits.

A notable innovation within the WRC Requirements is the comprehensive accounting for ecological leakage. This concept refers to unintended changes in greenhouse gas (GHG) emissions in areas that are hydrologically connected to the project site. By addressing ecological leakage, the WRC Requirements ensure a more accurate representation of a project’s net climate benefit.

The WRC Requirements integrate several innovative features to enhance the credibility and environmental integrity of wetland carbon projects. These include rigorous monitoring and verification protocols, ensuring that the carbon benefits claimed by projects are real, quantifiable, and contribute to global climate mitigation efforts.

By providing a structured framework and clear guidelines for blue carbon projects, Verra’s innovations encourage more entities to undertake conservation and restoration initiatives in coastal and tidal ecosystems. This not only helps sequester and store more carbon but also supports biodiversity conservation and provides socio-economic benefits to local communities.

The work of the Blue Carbon Working Group and the WRC Requirements contribute significantly to global climate action by expanding the scope and scale of projects that can generate tradable carbon credits. This creates financial incentives for the protection and restoration of critical wetland ecosystems, aligning with broader efforts to achieve the goals set forth in international climate agreements.

Such? innovation in coastal and tidal blue carbon through the establishment of the Blue Carbon Working Group and the development of the WRC Requirements represents a critical step forward in harnessing the power of natural ecosystems for climate mitigation. These efforts not only expand the potential for carbon crediting in unique and valuable ecosystems but also underscore the importance of wetlands in achieving global climate objectives.

Blue Guardians: The Climate Superpowers of Coastal and Tidal Ecosystems

Coastal and tidal blue carbon ecosystems, including mangroves, tidal salt marshes, and seagrass meadows, are powerful natural solutions to climate change, thanks to their remarkable ability to sequester and store carbon. These ecosystems outperform terrestrial forests in carbon storage per unit area, largely due to the rapid accumulation and slow decomposition of organic matter in their waterlogged soils. Let's delve deeper into the significance of these ecosystems, their benefits, and the methodologies available for their conservation and restoration.

Coastal and Tidal Blue Carbon Ecosystems

Mangroves are unique because they are adapted to live in saltwater along coastlines. Their dense roots trap sediments flowing down rivers to the sea, which helps in building land and storing carbon. This carbon is often locked away in the anoxic (oxygen-poor) conditions of mangrove soils for millennia.

Found in temperate regions, tidal salt marshes are grassland ecosystems flooded and drained by salt water brought in by the tides. They are highly productive and store carbon both in the plants and in the deep layers of peat beneath them.

Seagrass meadows grow in shallow, sheltered marine environments across the globe. They are highly efficient at capturing CO2 and can store it in the sediment below their roots, which can be several meters thick.

The physical structures of these ecosystems dissipate wave energy and reduce the impact of storm surges, protecting coastal communities from flooding and erosion.

They serve as critical nurseries for many marine species, supporting fisheries and aquaculture, which are vital for the livelihoods of millions of people worldwide. By filtering pollutants and trapping sediments, they improve water quality, benefiting both people and marine life. These ecosystems are some of the most biologically diverse areas on the planet, providing habitat for a wide range of species.

Verra has developed specific methodologies for projects aimed at conserving and restoring coastal and tidal blue carbon ecosystems. These methodologies provide a framework for quantifying, monitoring, and verifying the carbon benefits of such projects, enabling them to generate carbon credits. Here are some of the methodologies available:

  • VM0007 Methodology for Tidal Wetland and Seagrass Restoration: This methodology allows projects that restore tidal wetlands and seagrass habitats to quantify and credit the carbon sequestered as a result of restoration activities.?

  • VM0033 Methodology for the Conservation of Mangroves and Other Coastal Wetlands: Designed for projects aiming to conserve existing coastal wetland ecosystems, this methodology focuses on avoiding emissions that would result from their degradation or destruction.

  • VM0034 Methodology for Coastal Wetland Creation: This methodology provides guidance for projects that create new coastal wetland ecosystems, such as mangrove afforestation or seagrass meadow establishment, enabling them to quantify and claim the carbon stored.

The conservation and restoration of coastal and tidal blue carbon ecosystems are crucial not only for climate mitigation but also for the resilience of coastal communities and the health of marine environments. By leveraging methodologies like those developed by Verra, projects can access carbon finance to support their conservation and restoration efforts, providing a sustainable funding mechanism for these critical ecosystems.

As awareness of the importance of blue carbon ecosystems grows, it is vital to increase investment in and support for projects that preserve and restore these natural carbon sinks. Doing so will help ensure the long-term health of our planet and contribute significantly to global efforts to combat climate change.

Blue Depths: Unleashing the Climate Potential of the Ocean's Carbon Sink

Ocean blue carbon refers to carbon captured and stored by marine ecosystems, including the open ocean and its seabed, as well as specific activities like seaweed farming, kelp forest restoration, and seabed management. Unlike coastal and tidal blue carbon, which is stored in the biomass and soils of mangroves, salt marshes, and seagrass meadows, ocean blue carbon involves a broader range of processes and ecosystems that sequester carbon in ocean waters and marine sediments. This distinction highlights the vast potential of the ocean in contributing to carbon sequestration and the mitigation of climate change.

Marine Ecosystems and Carbon Sequestration

Seaweed and macroalgae grow rapidly and can absorb significant amounts of CO2 through photosynthesis. When harvested and used in products like biofuels, animal feed, or even buried in deep sea sediments, the carbon captured by seaweed can be sequestered away from the atmosphere for long periods.

Kelp forests are among the most productive ecosystems on Earth, capable of sequestering large amounts of carbon. Restoration efforts not only enhance biodiversity but also increase the capacity of these ecosystems to capture and store carbon. When kelp detritus falls to the ocean floor, it can be buried in sediments, effectively sequestering carbon.

The seabed plays a crucial role in the long-term storage of carbon. Activities aimed at protecting and managing seabed ecosystems, such as avoiding destructive fishing practices, can preserve the ocean's natural ability to store carbon in sediments.

The quantification and verification of carbon sequestration in these marine activities present unique challenges. Unlike terrestrial and coastal ecosystems, where carbon storage can be more directly measured, the dynamic nature of ocean systems and the difficulty in tracking carbon flows make it harder to quantify the exact amount of carbon sequestered. Moreover, the methodologies for crediting carbon storage in marine ecosystems under programs like the Verified Carbon Standard (VCS) are still under development.

Recognizing the potential of ocean blue carbon in climate mitigation, Verra is exploring the expansion of the VCS Program to include methodologies that support seaweed farming, kelp forest restoration, and seabed management. The development of these methodologies would require rigorous scientific research to ensure that carbon credits generated from ocean blue carbon projects accurately reflect the amount of CO2 sequestered.

The scientific community is actively investigating the carbon storage potential of marine ecosystems. Research focuses on understanding the mechanisms through which these ecosystems capture and store carbon, the longevity of carbon storage, and the impacts of human activities on these natural processes.

For ocean blue carbon projects to contribute significantly to climate mitigation, supportive policies and market mechanisms are necessary. This includes the development of clear guidelines for the verification and trading of carbon credits generated from marine-based projects.

The inclusion of ocean blue carbon in carbon crediting schemes like those overseen by Verra could unlock new opportunities for climate action. By providing financial incentives for the conservation and restoration of marine ecosystems, these schemes can enhance the natural capacity of the ocean to sequester carbon while supporting biodiversity and the livelihoods of coastal communities.

As the methodologies for ocean blue carbon projects are refined and implemented, they will represent a significant advancement in the field of carbon markets. This expansion could lead to increased investment in marine conservation projects, contributing to the global effort to combat climate change and protect the marine environment.

Charting New Depths: Pioneering Ocean Blue Carbon Innovations

Verra's innovation in the realm of ocean blue carbon is a pivotal development in the fight against climate change, showcasing a proactive approach towards leveraging the vast potential of the ocean in carbon sequestration efforts. The establishment of the Ocean Carbon Working Group and the launch of the Seascape Carbon Initiative (SCI) are significant steps toward integrating ocean-based activities into the global carbon market. These initiatives aim to develop robust, market-oriented methodologies for ocean-based carbon sequestration projects, expanding the scope of nature-based solutions to include the ocean's critical role in mitigating climate change.

Ocean Carbon Working Group

The Ocean Carbon Working Group (WG) represents Verra’s commitment to harnessing expert knowledge for the advancement of ocean blue carbon projects. By bringing together experts in marine sciences, carbon markets, and environmental policy, the WG aims to identify the challenges and opportunities associated with ocean-based carbon sequestration projects.

The WG's primary mission is to explore and recommend updates to the Verified Carbon Standard (VCS) Program that would make it more inclusive of ocean-based project activities. This includes identifying gaps in current methodologies and suggesting new frameworks that could accommodate the unique aspects of ocean carbon sequestration. By developing new or updated methodologies, the WG seeks to lower the barriers to entry for projects focused on seaweed farming, kelp restoration, and other marine activities that have the potential to sequester carbon. Members of the WG offer valuable insights into the scientific, technical, and market-based considerations necessary for the successful integration of ocean blue carbon projects into the VCS Program.

Seascape Carbon Initiative (SCI)

The SCI is a collaborative effort led by Verra and supported by external partners such as Silvestrum Climate Associates, the Blue Marine Foundation, the Blue Carbon Initiative, and Oceans 2050. The initiative aims to spearhead the development of carbon crediting methodologies that are specific to marine activities, addressing emerging issues, research needs, and legal considerations.


The SCI serves as a platform for engaging with stakeholders across the marine conservation and carbon markets spectrum, offering guidance on the development of methodologies for ocean blue carbon projects. A significant focus of the SCI is to support research into the carbon sequestration potential of various marine activities and to translate this research into actionable, scientifically robust methodologies for carbon crediting.Recognizing the complex legal landscape of marine environments, the SCI also aims to address relevant legal and policy considerations to ensure that ocean blue carbon projects are viable and compliant with international standards. As the independent standard-setter, Verra ensures that the methodologies developed through the SCI adhere to high standards of environmental integrity and contribute meaningfully to global climate mitigation efforts.

The work of the Ocean Carbon Working Group and the Seascape Carbon Initiative is poised to make significant contributions to the field of carbon markets and climate change mitigation. By developing methodologies that enable the quantification and verification of carbon sequestered by ocean-based activities, these initiatives open up new avenues for investment in marine conservation projects. This not only aids in the global fight against climate change but also supports biodiversity, enhances coastal resilience, and provides socio-economic benefits to communities dependent on marine ecosystems.

As Verra continues to innovate in ocean blue carbon, the potential for these initiatives to drive positive environmental outcomes is immense. The integration of ocean-based activities into the VCS Program represents a forward-looking approach to climate action, recognizing the ocean's vital role in the Earth's climate system and leveraging its potential as a natural solution to climate change.


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Woodley B. Preucil, CFA

Senior Managing Director

9 个月

Andrea Frosinini Very insightful. Thank you for sharing

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