Vivent Carbon pioneers scalable ocean-based carbon removal across three complementary pathways — seaweed cultivation, seagrass restoration, and coastal alkalinity enhancement — working with fishing communities across the Indo-Pacific to turn ocean health into verified carbon income.
The ocean is already the planet's largest active carbon sink — but centuries of pollution, warming, acidification, and coastal habitat destruction have progressively degraded this capacity. Ocean-based carbon dioxide removal (CDR) encompasses a growing portfolio of approaches that work with marine ecosystems to measurably increase the ocean's uptake and long-term storage of atmospheric CO₂.
Vivent Carbon focuses on three community-deployable pathways: seaweed cultivation (macroalgae farmed by coastal communities that sequesters carbon as it sinks or is processed), seagrass restoration (recovering the world's most carbon-dense coastal meadows), and coastal alkalinity enhancement (spreading crushed alkaline minerals in coastal zones to accelerate the ocean's natural carbon chemistry). A fourth pathway — shellfish reef restoration — is in early pilot in Australia.
Vivent is deliberate about MRV rigour for ocean CDR. Unlike well-established land pathways, ocean carbon accounting is an active area of scientific development. We partner with three university research groups (James Cook University, IIT Madras, University of the Philippines Visayas) to build measurement protocols that meet emerging Isometric and Frontier fund standards — and we only issue credits against methodologies that have cleared third-party scientific review.
Each pathway uses different ocean chemistry and biology — giving buyers access to a diversified, high-integrity ocean carbon portfolio.
Community-operated offshore and near-shore macroalgae farms (Eucheuma, Sargassum, Gracilaria) cultivate fast-growing seaweed that absorbs CO₂ during growth. Carbon is removed when seaweed sinks to depth or is converted to biochar or biostimulant products — preventing decomposition at the surface.
Seagrass meadows are among the most carbon-dense ecosystems on Earth, storing carbon in both above-ground blades and centuries-deep sediments. Vivent plants native Posidonia, Thalassia, and Cymodocea species in degraded coastal zones, with community divers conducting planting and monitoring across shallow coastal beds.
Spreading ground olivine, basalt, or calcium carbonate in high-energy coastal zones dissolves minerals that shift ocean chemistry — increasing alkalinity and enabling the ocean to absorb more atmospheric CO₂ while simultaneously counteracting ocean acidification. Community fishing boats deploy material as part of normal sea operations.
Oyster, mussel, and native shellfish reefs filter seawater, stabilise sediment, and sequester carbon in both shell material and promoted seagrass growth in adjacent areas. Early pilot with Gippsland Fishing Co-operative in Victoria, Australia. MRV framework in development with CSIRO.
Ocean CDR requires more scientific rigour than land-based carbon — Vivent builds MRV infrastructure before issuing a single credit.
Marine biologists and oceanographers conduct site surveys measuring existing carbon stocks, water chemistry, species composition, and hydrodynamics. Baseline dissolved inorganic carbon (DIC) and dissolved organic carbon (DOC) measurements establish the additionality baseline.
Local fishing cooperatives, village councils, and marine protected area management bodies are engaged as project co-owners. Use-right agreements documented. Community members trained as marine technicians and paid as project employees throughout.
For seaweed: longlines installed, seed stock sourced from local wild populations, community farmers trained in cultivation cycles. For seagrass: community dive teams transplant nursery-raised shoots to prepared sandy substrate. For alkalinity: deployment vessels equipped and schedules established.
Autonomous water quality buoys measure pH, alkalinity, dissolved oxygen, and DIC continuously. Satellite ocean colour imagery tracks biomass. Quarterly sediment cores and biomass harvests calibrate models. All data streamed to Vivent's ocean carbon dashboard in real time.
Annual data packages submitted to partner universities (JCU, IIT Madras, UPV) for independent analysis. Findings published openly. Any upward revision of carbon accounting methodology requires peer-reviewed evidence before credits are adjusted.
Annual verification by Isometric-approved third-party auditors. Uncertainty ranges published with every credit issuance — buyers receive credit certificates showing both central estimate and upper/lower bounds, with clear permanence assumptions.
≥65% of credit proceeds distributed to participating fishing cooperative members within 30 days of settlement. Seaweed and shellfish product revenue provides additional non-carbon income, reducing dependence on carbon price alone.
Annual science review triggers management adjustments — relocating farms away from bleaching zones, adjusting alkalinity application rates based on chemistry feedback, or switching species based on survivorship data. Science drives management, not targets.
Unlike some CDR approaches, Vivent's marine pathways are designed to improve ocean ecosystem health as a primary outcome — not a side effect.
Seaweed farms and seagrass meadows create nursery habitat for commercially important fish and invertebrates. Communities adjacent to pilot sites report 25–60% increases in nearshore catch within 3 years of establishment.
Coastal alkalinity enhancement directly raises ocean pH, counteracting acidification that is dissolving coral reefs and shellfish exoskeletons. A 0.1 pH unit increase in pilot zones has been measured within 12 months of application.
Seagrass meadows support dugongs, sea turtles, and critically endangered seahorse species. Seaweed farms provide structural habitat in otherwise bare sandy or degraded seafloor — increasing invertebrate diversity by 180–340% in monitored plots.
Seaweed farming is historically a women-led activity across Southeast Asia. Vivent's programmes formalise and expand this role — 72% of enrolled seaweed farmers are women, with carbon income going directly to their households.
Seaweed and seagrass absorb excess nitrogen and phosphorus from coastal runoff — nutrient pollution that causes destructive algal blooms. Monitored sites show 35–55% reduction in dissolved inorganic nitrogen within established farm zones.
Seaweed sells into food, cosmetics, and biostimulant markets independent of carbon. Shellfish reefs support artisanal fishing. Carbon credits, seaweed product sales, and fishery income create three independent revenue streams per community.
The Indo-Pacific contains over 60% of the world's tropical coastal ecosystems — and some of the highest-potential ocean CDR sites on Earth.
Eucheuma and Kappaphycus seaweed cultivation across 12 coastal barangays in Cebu, Bohol, and Leyte provinces. Philippines produces 80% of the world's commercial seaweed — Vivent adds carbon MRV to existing farming systems rather than building from scratch.
Thalassia hemprichii and Cymodocea rotundata seagrass restoration across degraded beds in the Madura Strait and Gili Islands marine park zone. Community dive teams of 180 trained divers conduct planting and quarterly monitoring surveys.
Shellfish reef restoration and coastal alkalinity enhancement pilot with the Gippsland Fishing Co-operative in Victoria, in partnership with CSIRO Marine and Atmospheric Research. Olivine sourced from existing Australian quarries. MRV framework under development for 2026 credit issuance.
Vivent's Cebu seaweed programme launched in 2023, adding a carbon MRV layer to pre-existing seaweed farming operations across 12 barangays in the municipality of San Francisco, Cebu. Rather than establishing new farms, Vivent worked with the existing Cebu Seaweed Farmers Cooperative (2,400 members) to instrument their existing 1,800 ha of longline farms with water quality sensors and biomass tracking protocols.
Year 2 monitoring — verified by Isometric and peer-reviewed by James Cook University — confirmed 8,400 tCO₂e of net ocean carbon removal, representing the first large-scale verified seaweed carbon issuance in the Philippines. Average farmer carbon income was ₱18,200 ($320) in Year 2, supplementing seaweed product sales of ₱42,000 ($740) per household. The programme has attracted follow-on interest from 3 additional cooperatives covering 4,200 additional farmers.
Vivent's ocean carbon credits are among the most rigorously verified in the voluntary market — backed by university science, community stewardship, and transparent uncertainty accounting.