The Japan blue carbon market was valued at USD 25 million in 2025. This market is expected to reach USD 205 million by 2036, growing from USD 30 million in 2026, at a CAGR of 21.2% from 2026 to 2036.

The market covers the economic activity around carbon captured and stored by coastal and marine ecosystems in Japan, including the issuance and trading of blue carbon credits, project development and ecosystem restoration, measurement, reporting and verification services, and related advisory work. It centres on the J-Blue Credit scheme operated by the Japan Blue Economy Association, a body authorised by the Ministry of Land, Infrastructure, Transport and Tourism, which certifies carbon removals by seagrass meadows, seaweed and macroalgae beds, and, more recently, mangroves. Demand is driven by government climate policy and the emissions trading scheme, by corporate demand for local, high-integrity credits with coastal co-benefits, and by Japan's scientific and institutional leadership in blue carbon. The market is nascent, with small credit volumes at high unit prices, but is growing quickly from a low base.

Key Highlights – Japan Blue Carbon Market

• The Japan blue carbon market is expected to reach USD 205 million by 2036, at a CAGR of 21.2% from 2026 to 2036, driven by climate policy, emissions-trading demand, and corporate procurement of high-integrity local credits, from a very small base.
• A national inventory first. In April 2024 Japan became the first country to report carbon removals by seagrass meadows and seaweed beds in its national greenhouse-gas inventory, at about 0.34 million tonnes of CO2, establishing scientific and institutional credibility.
• The J-Blue Credit scheme leads. The Japan Blue Economy Association, authorised by the Ministry of Land, Infrastructure, Transport and Tourism, operates the J-Blue Credit scheme, which had certified about 61 blue carbon projects and 471 transactions since issuance began in 2021.
• Macroalgae dominates the resource. Japan's estimated annual blue carbon absorption is about 1.32 to 4.04 million tonnes, with macroalgal beds contributing about 54%, seagrass meadows about 23%, and mangroves about 14%.
• Small volumes at high prices. Blue carbon credits in Japan trade at about 8,000 to over 13,000 yen per tonne of CO2, well above forestry credits, with individual transactions small in volume but high in unit value and often matched locally.
• Policy is scaling demand. Japan amended its J-Credit scheme in 2024 to allow blue carbon removal credits, and the launch of GX-ETS Phase 2 in fiscal 2026 is expected to expand corporate demand sharply.
• Key participants include the Japan Blue Economy Association, ITOCHU Corporation, Marubeni Corporation, Mitsui O.S.K. Lines, and Sumitomo Corporation.

Report Overview

The Japan blue carbon market covers the activity around carbon sequestered by coastal and marine ecosystems, spanning blue carbon credit issuance and trading, project development and restoration, measurement, reporting and verification services, and advisory work. The core is the J-Blue Credit scheme run by the Japan Blue Economy Association, which certifies removals by seagrass and eelgrass meadows, seaweed and macroalgae beds, and mangroves, alongside blue carbon removal credits under the amended J-Credit scheme. Broader ocean and fisheries activity is outside the scope except where it generates blue carbon value. The market is nascent and policy-driven, with small credit volumes at high unit prices and rapid growth. This report examines the size, drivers, ecosystems, offerings, buyers, crediting standards, pricing, project distribution, participants, recent developments, and outlook of the market, and provides recommendations. Sizing is built bottom-up from credit issuance and prices, project development and restoration activity, and verification and advisory services, and reflects total blue carbon economic activity rather than credit transactions alone, which are currently very small.

Key Market Dynamics

Market Drivers

The main drivers of the Japan blue carbon market are government climate policy and emissions-trading demand, corporate demand for local high-integrity credits, and Japan's scientific and institutional leadership. Government policy is the primary driver, as Japan's 2050 net-zero target, its nature-positive strategy, the 2024 amendment allowing blue carbon removal credits under the J-Credit scheme, and the launch of GX-ETS Phase 2 in fiscal 2026 create policy pull for blue carbon, and the nature-based credit market is forecast to grow from about 1.3 billion yen in 2024 toward 32 billion yen by 2030. Corporate demand for local, high-integrity credits is a strong driver, as blue carbon credits offer coastal restoration, biodiversity and community co-benefits and a local sustainability story, so companies pay high unit prices, and about 40% of J-Blue Credit transactions occur within the same municipality as the project. Scientific and institutional leadership is a foundational driver, as Japan became the first country to report seagrass and seaweed removals in its national greenhouse-gas inventory in April 2024, giving the market credibility. These factors, policy, corporate demand, and institutional credibility, are the main drivers, supported by port authorities and local governments developing projects.

Key Opportunities

The market offers opportunities in macroalgae and seaweed carbon, in measurement and verification technology, and in corporate and port procurement. Macroalgae and seaweed carbon is the leading opportunity, because macroalgal beds contribute about 54% of Japan's estimated blue carbon absorption and Japan has recognised wild and farmed kelp within its blue carbon system, giving the country a distinctive resource base. Measurement and verification technology is an opportunity, since credibility depends on quantifying carbon removals, and Japan uses satellite imagery and field methods to estimate near-shore blue carbon, creating demand for monitoring, reporting and verification services and tools. Corporate and port procurement is an opportunity as emissions-trading and voluntary demand grow, with trading companies, shipping lines and manufacturers buying credits and ports and local governments developing projects. These areas, macroalgae carbon, verification technology, and corporate and port procurement, are the main opportunities, alongside mangrove projects and international expansion of the model.

Market Trends

Current trends include rapid growth of J-Blue Credit projects, integration into national accounting and emissions trading, high unit prices with small locally matched volumes, and diversification of ecosystems. Rapid project growth is the defining trend, as the J-Blue Credit scheme has certified about 61 projects and 471 transactions since issuance began in 2021, expanding along Japan's coasts. Integration into national accounting and emissions trading is a structural trend, following the April 2024 inventory inclusion, the 2024 J-Credit amendment for blue carbon, and the GX-ETS Phase 2 launch in fiscal 2026. High unit prices with small, locally matched volumes are a market-structure trend, with credits at about 8,000 to 13,000 yen per tonne and much of the trade occurring within the same municipality. Diversification of ecosystems is an emerging trend, with the first mangrove-planting blue carbon credits generated in Japan in December 2025, extending beyond seagrass and seaweed. These trends indicate a small but rapidly institutionalising market.

Report Summary

Segmental Analysis

Market by Ecosystem Type

By ecosystem type, the market comprises macroalgae and seaweed beds, seagrass and eelgrass meadows, tidal flats and salt marshes, and mangroves. Macroalgae and seaweed beds hold the largest share, at about 54% of the market in 2026, consistent with macroalgal beds contributing about 54% of Japan's estimated blue carbon absorption, with the remaining share divided across seagrass meadows, tidal flats and salt marshes, and mangroves. Macroalgae and seaweed beds, including sargassum and kelp, are the largest ecosystem because Japan has extensive macroalgal resources and has recognised wild and farmed kelp within its blue carbon system, and macroalgae is the country's distinctive strength. Seagrass and eelgrass meadows contribute about 23% of absorption and are a core ecosystem for J-Blue Credit projects. Tidal flats and salt marshes contribute coastal carbon, and mangroves, contributing about 14% of absorption and concentrated in southern Japan, are the newest addition following the first mangrove credits in December 2025. The dominance of macroalgae reflects Japan's resource base and scheme scope.

Market by Offering

By offering, the market comprises carbon credits, project development and restoration, measurement, reporting and verification services, and advisory work. Project development and restoration holds the largest share, at about 40% of the market in 2026, with the remaining share divided across carbon credits, verification services, and advisory. Project development and restoration, including seagrass and seaweed bed restoration and conservation, is the largest offering because building and maintaining blue carbon projects is where most spending occurs in a market whose credit volumes are still very small. Carbon credits, the issuance and trading of J-Blue Credit and blue carbon removal credits, are high in unit value but small in volume, so they account for a substantial but not dominant share. Measurement, reporting and verification services are essential to credibility and grow with the scheme, using satellite and field methods. Advisory work supports project design, certification and buyer matching. The prominence of project development reflects the early, build-out stage of the market.

Market by End User

By end user, the market comprises corporates, ports and local governments, shipping and logistics, and other buyers. Corporates hold the largest share, at about 55% of the market in 2026, with the remaining share divided across ports and local governments, shipping and logistics, and others. Corporates are the leading end user because companies buy blue carbon credits to offset emissions and to support local coastal restoration with a credible sustainability story, with trading companies and manufacturers among active buyers. Ports and local governments are important participants that develop projects and buy credits, reflecting the maritime and municipal roots of the scheme. Shipping and logistics companies, including shipping lines, buy credits to offset marine emissions. Other buyers, including financial and service companies, complete the segment, with service companies more inclined toward innovation-focused projects. The dominance of corporate buyers reflects offsetting and sustainability demand.

Market by Crediting Standard

By crediting standard, the market comprises the J-Blue Credit scheme, blue carbon credits under the J-Credit scheme, and voluntary or international standards. The J-Blue Credit scheme, operated by the Japan Blue Economy Association, holds the largest share, as it is the established, MLIT-authorised route for certifying blue carbon removals and accounts for most projects and transactions to date. Blue carbon removal credits under the J-Credit scheme, enabled by the 2024 amendment, are an emerging route that links blue carbon to the national credit and emissions-trading framework. Voluntary and international standards account for a small share. The dominance of J-Blue Credit reflects its first-mover role and institutional backing, while the J-Credit route is expected to grow with emissions-trading integration.

Geographic Analysis

National Scheme and Coastal Distribution

Japan operates a national blue carbon scheme through the Japan Blue Economy Association, and projects are distributed along the country's extensive coastline, with seagrass and seaweed bed projects in many coastal prefectures and mangrove projects concentrated in the warmer south. The scheme's maritime and municipal roots mean many projects are led by ports, local governments and fishing cooperatives, and the market has a strong local character, with about 40% of J-Blue Credit transactions occurring within the same municipality as the project. This local matching reflects the community and coastal co-benefits that motivate buyers.

Northern and Cold-Water Regions

Northern regions, including Hokkaido and Tohoku, host extensive kelp and seaweed resources relevant to macroalgal blue carbon, and Sumitomo Corporation developed a J-Blue Credit project in Hirono Town, Iwate Prefecture. These cold-water regions align with Japan's macroalgae strength, though warming waters that affect seaweed beds are a consideration for the permanence of the resource.

Southern and Warm-Water Regions

Southern regions, including Kyushu and the subtropical southwest, host mangroves and warm-water coastal ecosystems, and the first mangrove-planting blue carbon credits in Japan were generated in this setting in December 2025. These regions extend the ecosystem base of the market beyond seagrass and seaweed, and represent the newest area of project development.

Pricing Analysis

Pricing in blue carbon reflects the scarcity, credibility and co-benefits of credits rather than commodity carbon value. Blue carbon credits in Japan trade at about 8,000 to over 13,000 yen per tonne of CO2, and some small transactions have been valued much higher, well above forestry J-Credits at around 4,400 yen per tonne. The premium reflects the coastal restoration, biodiversity and local community co-benefits of blue carbon, the credibility of the J-Blue Credit scheme and Japan's national inventory inclusion, and the small volumes available.

Several factors set price. Scarcity is central, since credit volumes are very small and demand for local, high-integrity credits is strong. Co-benefits raise value, as buyers pay for the coastal, biodiversity and community outcomes alongside carbon. Credibility supports price, with the MLIT-authorised scheme and national accounting underpinning trust. Locality matters, as many buyers value credits from projects in their own municipality. Project and verification costs, including restoration and monitoring, sit behind the price. The trajectory of pricing depends on how volumes scale against demand as emissions trading expands; larger supply could moderate unit prices, while strong policy and corporate demand for co-benefit credits supports continued premium pricing relative to other credit types.

Competitive Landscape

The market is organised around a central scheme operator, trading and shipping companies as developers and buyers, marine construction and restoration firms, and local project owners. The Japan Blue Economy Association is the central institution, authorised by the Ministry of Land, Infrastructure, Transport and Tourism, operating the J-Blue Credit scheme and certifying projects and credits. Trading companies including ITOCHU Corporation, which generated the first mangrove blue carbon credits in Japan, Marubeni Corporation, and Sumitomo Corporation, which developed a project in Hirono Town, Iwate, are active as developers and buyers, alongside Mitsubishi Corporation. Mitsui O.S.K. Lines and other shipping lines buy credits to offset marine emissions. Marine construction firms such as Penta-Ocean Construction and Toa Corporation and restoration specialists such as Urchinomics, which restores kelp by managing sea urchins, contribute project and restoration capability, and Idemitsu Kosan and other energy and industrial firms participate.

Competition and collaboration turn on project development capability, verification credibility, buyer relationships and local partnerships, and projects typically involve several co-creators, averaging about three per project. The market is small and collaborative rather than sharply competitive, with the scheme operator central and trading companies, shipping lines, marine contractors, ports, local governments and fishing cooperatives forming the ecosystem. As policy and emissions-trading demand scale, the field is likely to attract more corporate buyers, developers and service providers, and participants that can develop credible, co-benefit-rich projects and connect them to buyers are best positioned.

Key Players

The active participants in the market as of September 2026 include:

• Japan Blue Economy Association (JBE)
• ITOCHU Corporation
• Marubeni Corporation
• Mitsui O.S.K. Lines, Ltd.
• Sumitomo Corporation
• Mitsubishi Corporation
• Penta-Ocean Construction Co., Ltd.
• Toa Corporation
• Idemitsu Kosan Co., Ltd.
• Urchinomics
• Ports, Local Governments, and Fishery Cooperatives
• Other Companies

Voice of Customer

Sustainability manager, trading company (Japan): "We buy and develop blue carbon credits because they combine emissions offsetting with real coastal restoration and a local story that resonates with stakeholders. The volumes are small and the price is high compared with forestry credits, but the co-benefits and the credibility of the national scheme are what we are paying for, and we expect demand to grow as the emissions-trading scheme expands."

Environmental officer, port authority (Japan): "Restoring seagrass and seaweed beds supports our coastal environment and generates credits we and local companies can use. The scheme lets ports and municipalities turn restoration into recognised carbon removal, and much of the interest comes from companies in our own region who want local projects."

Procurement lead, shipping company (Japan): "Blue carbon credits let us offset marine emissions with a maritime, Japan-based solution that fits our business. We look at the credibility of the measurement and the co-benefits, and while supply is limited today, the national inventory inclusion and policy support give us confidence in the market."

Analyst Perspective

Japan's blue carbon market is a small but rapidly institutionalising market in which the country is a global first mover. The foundation is scientific and institutional: Japan became the first country to report seagrass and seaweed removals in its national greenhouse-gas inventory in April 2024, and the J-Blue Credit scheme, run by the MLIT-authorised Japan Blue Economy Association, has certified about 61 projects and 471 transactions since 2021. Macroalgae is the distinctive resource, contributing about 54% of the country's estimated blue carbon absorption, and Japan's recognition of wild and farmed kelp sets it apart. Policy is scaling demand, with the 2024 J-Credit amendment for blue carbon and the fiscal 2026 launch of GX-ETS Phase 2, and the broader nature-based credit market is forecast to grow roughly twenty-five-fold to about 32 billion yen by 2030.

The honest considerations are scale, permanence, and price. This is a very small market today; credit volumes are tiny, individual transactions average only a few tonnes, and much of the value is in project development and restoration rather than credit trading, so the market size should be read as nascent and the figures treated with caution. Scientific questions about the measurement and permanence of macroalgal carbon remain, and the credibility of the scheme depends on continued rigour. Prices are high, at about 8,000 to 13,000 yen per tonne, reflecting scarcity and co-benefits, and could moderate as supply scales, though strong policy and corporate demand for local, high-integrity credits support premium pricing. The market should be assessed on policy support, verification credibility, and the pace of emissions-trading demand rather than on current volumes, and Japan's first-mover institutional position, macroalgae resource, and policy momentum support fast growth from a very small base.

Key Strategic Developments

• April 2024: Japan became the first country to report carbon removals by seagrass meadows and seaweed beds in its national greenhouse-gas inventory, at about 0.34 million tonnes of CO2, establishing the scientific basis for the market.
• 2024: Japan amended its J-Credit scheme to allow the creation of blue carbon removal credits, linking blue carbon to the national credit and emissions-trading framework.
• 2021-2026: The J-Blue Credit scheme, operated by the Japan Blue Economy Association, grew to about 61 certified projects and 471 transactions since issuance began in 2021.
• December 2025: ITOCHU Corporation announced the first blue carbon credits generated through mangrove planting in Japan, extending the market beyond seagrass and seaweed ecosystems.
• Fiscal 2026: The launch of GX-ETS Phase 2 is expected to expand corporate demand for carbon credits, including blue carbon, supporting rapid growth of the nature-based credit market toward about 32 billion yen by 2030.

Strategic Recommendations

For project developers and trading companies, the priority is to build credible, co-benefit-rich blue carbon projects and connect them to buyers, because the market is small and its growth depends on a pipeline of verifiable projects and on the credibility that sustains premium prices. Companies should develop seagrass, seaweed and mangrove projects with rigorous measurement, partner with ports, local governments and fishing cooperatives, and align with the J-Blue Credit and J-Credit schemes and emissions-trading demand. Investing in monitoring, reporting and verification and in the science of macroalgal carbon strengthens credibility and market position.

For corporate and shipping buyers, the recommendation is to procure blue carbon credits where local, high-integrity, co-benefit credits fit sustainability strategy, recognising the high price and limited supply, and to engage early as emissions-trading demand scales. For ports, local governments and fishing cooperatives, developing restoration projects turns coastal stewardship into recognised carbon removal and local economic value. For policymakers, continued support for the scheme, the science of blue carbon measurement and permanence, and integration into emissions trading underpins the market's growth and integrity. For investors, this is a nascent market to evaluate on policy support, verification credibility, and the pace of demand rather than on current volumes, recognising that Japan's first-mover institutional position and macroalgae resource support fast growth from a very small base while scale, permanence and price remain the key uncertainties.