Blue carbon refers to the carbon captured and stored by coastal and marine ecosystems: mangrove forests, seagrass meadows and salt marshes. These remarkable environments play a powerful role in removing carbon dioxide (CO₂) from the atmosphere and storing it for long periods, often centuries or even thousands of years. They are, in short, some of the most effective natural climate solutions on the planet.
This blog draws on the High-Quality Blue Carbon Practitioners Guide, published in 2024 by the Ocean Risk and Resilience Action Alliance (ORRAA), to explore what separates a genuinely high-quality blue carbon project from one that simply carries the label.
How Blue Carbon Works
The process begins with photosynthesis. Coastal plants absorb CO₂ from the air and store it as carbon in their leaves, roots and surrounding sediment. What makes these ecosystems so exceptional is the longevity of that storage. Unlike terrestrial forests, where decomposing plant material can release carbon relatively quickly, the waterlogged, oxygen-poor conditions of coastal sediments slow decomposition to almost nothing. Carbon locked away in mangrove or seagrass sediment can remain there for millennia.
This is why protecting these ecosystems is so critical. When they are degraded or destroyed, that stored carbon is released back into the atmosphere, undoing centuries of natural carbon sequestration in a very short space of time.
Why These Ecosystems Are Under Threat
Although coastal and marine plants are less vulnerable to fire than land-based forests, they face a formidable range of pressures. Coastal development, overfishing, destructive fishing practices and pollution all take a significant toll. On top of that, the effects of climate change, including rising sea temperatures, ocean acidification, sea level rise and increasingly severe storms, are placing these ecosystems under mounting strain.
The result is a troubling paradox: the very ecosystems best placed to help us address climate change are themselves among the most threatened by it. Acting to protect and restore them is therefore not just environmentally important. It is urgent.
What Makes A Blue Carbon Project High Quality?
The High-Quality Blue Carbon Practitioners Guide sets out five core principles that distinguish genuinely impactful projects from those that fall short.
- Safeguard Nature. High-quality projects must protect intact ecosystems and design interventions based on sound ecological science. The goal is to do no harm: avoiding the introduction of invasive species, preventing carbon “leakage” where destruction simply moves elsewhere, and ensuring the ecological health of the project area is maintained or improved over time.
- Empower People. Communities that live in and depend on coastal ecosystems must be active partners, not passive observers. This means establishing Free, Prior and Informed Consent (FPIC) before a project begins, ensuring inclusive participation throughout, and putting in place clear mechanisms for feedback and accountability. Benefit sharing must be equitable, and local communities must have genuine ownership over decisions that affect them.
- Employ the Best Information and Carbon Accounting Practices. High-quality projects use scientifically robust methods to measure and monitor carbon storage. They establish accurate baselines, demonstrate genuine additionality, and use transparent, independently verified accounting. Indigenous, traditional and local ecological knowledge is incorporated alongside scientific data, recognising that the people who know these environments best have an irreplaceable role to play.
- Operate Locally and Contextually. There is no one-size-fits-all approach to blue carbon. High-quality projects are designed around the specific social and ecological context in which they operate, with a diverse network of local partners to ensure both success and longevity. Policies and governance structures must reflect local realities, not just international frameworks.
- Mobilise High-Integrity Capital. Funding must follow a clear mitigation hierarchy: reduce emissions first, offset what remains. Financial arrangements should be transparent, pricing should be fair, and benefit-sharing agreements should be structured to deliver lasting value to local communities. Carbon credits from high-quality projects support genuine climate action; they do not provide cover for inaction elsewhere.
Carbon Is Not the Only Benefit
This is a point worth emphasising. High-quality blue carbon projects deliver far more than carbon sequestration. They protect biodiversity, strengthen coastlines against erosion and storm damage, sustain fish stocks and the livelihoods that depend on them, and support the health and resilience of coastal communities. When these projects are designed well, the benefits for nature and people are just as significant as the climate benefits.
For those of us who live and work close to the sea, this interconnection is easy to understand. Nature, coastal protection and local livelihoods are inseparable. High-quality blue carbon is built on exactly that understanding.
Why This Matters For The Yachting Community
The superyacht industry operates across the world’s most extraordinary coastal environments. The oceans that provide the backdrop to this industry are the same oceans that blue carbon ecosystems exist to protect. Supporting high-quality blue carbon projects is therefore not simply a matter of offsetting emissions. It is a practical expression of responsibility towards the marine environments we are privileged to explore.
When carbon credits are sourced from genuinely high-quality projects, they deliver a triple benefit: carbon kept stored in coastal sediments, coastlines and ecosystems protected for future generations, and local communities empowered to be the long-term guardians of the environments they call home.
Done properly, blue carbon is climate action, nature conservation and community investment all at once. That is what high quality looks like.