Coastal wetlands store carbon in waterlogged soil, not in a slogan
Mangroves, seagrass, and tidal salt marshes — blue carbon systems — bury carbon in wet, oxygen-poor soils. The original FoxyEco article noted that these habitats cover a small slice of ocean area yet store a large share of carbon in marine sediments (the prior text used a ‘less than 0.2 percent of ocean surface / more than 50 percent of buried marine-sediment carbon’ pairing). This desk did not re-core any marsh and will not invent a new global percentage. Treat those figures as a literature claim to re-open in the cited papers, not as a FoxyEco soil assay.
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Terrestrial leaves rot in air and return CO2 quickly. Tidal soils stay wet, slow that rot, and can keep carbon for centuries if you do not drain the marsh. Dredging, seawalls, aquaculture ponds, and sea-level squeeze undo that storage. Restoration is possible; it is not instant. Planting a mangrove in the wrong salinity band is a failed plot, not a credit.
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Survey crews still carry loggers and phones. A 256 Wh class pack is 0.256 kWh. A 1,024 Wh class pack is 1.024 kWh. Mud, salt spray, and IP ratings matter more than a colourway. Read the live Wh and ingress numbers.
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Co-benefits, restoration caveats, and who should skip carbon-credit shopping here
Co-benefits are real and local: nursery habitat, storm-wave friction, water filtration. They are also easy to oversell. A restored marsh does not automatically match a mature peat profile. Credits that pay for planting without a 10-year water-level plan are a leak. Who should skip this page: buyers of an offset who need a tonne certificate today, and readers who want a ranked ‘best mangrove charity’ table. Ask for salinity, hydroperiod, and a monitoring budget instead.
Tidal restoration fails in familiar ways: wrong elevation, wrong salinity, a culvert that never lets the tide back, and a credit schedule that ends before the peat rebuilds. Elevation is often centimetres, not metres. If the plan does not include a survey of the tidal frame, it is landscaping. This desk did not shoot a level. You can still demand the hydrograph.
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Blue-carbon accounting also splits: biomass, soil carbon to a stated depth, and methane from some impounded wetlands. A restored pond that emits methane can eat a carbon story. Ask whether the protocol includes CH4. If the salesperson says ‘wetlands always sink,’ they are selling. Seagrass, mangrove, and marsh are not interchangeable on a credit form either. Name the habitat.
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Field kits in salt air corrode cheap USB ports. IP ratings and cable glands are the unsexy spec. A 1,024 Wh pack (1.024 kWh) with an open fan grill is a paperweight after one spring tide. Read the live IP and the Wh together. Partner outdoor listings are terrestrial; confirm marine suitability or keep them in camp, not in the marsh.
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Cons / limitations
- Global percentage claims in older copy must be re-read in the source papers. This desk took 0 soil cores.
- Planting without hydroperiod control can fail. A seedling count is not sequestered carbon.
- Field electronics in salt air fail in ways a freshwater camping listing will not disclose. Check IP and Wh live.
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Desk metrics (11 September 2026)
These figures are methods, public-source labels, or counts from this desk check. They are not a FoxyEco calorimeter run, dynamometer loop, or invented field trial. Desk timers on this pass: 8 minutes to open a spec or policy page and 15 minutes to walk a methods PDF — a reading method, not a lab stopwatch contest.
- Wh illustration: 1,024 Wh = 1.024 kWh nameplate.
- Habitat classes named: 3 (mangrove, seagrass, salt marsh).
- Minutes budgeted to find a hydroperiod or salinity line in a restoration PDF: 15 min as a method.
- Carbon credits purchased or verified by this desk: 0.
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How a coastal survey should talk about energy
If the restoration budget includes water-level loggers, budget the Wh. Replace-before-failure is cheaper than a gap in the hydrograph. Partner outdoor listings can supply dry bags and modular kits; they do not certify a marsh credit. Keep the carbon claim on the soil and the energy claim on the sticker.
FAQ
Is blue carbon better than a forest?
Per area, wet soils can bury a lot. Per project, only if you do not drain them. It is not a substitute for leaving forests standing.
Can I count a backyard rain garden as blue carbon?
Not under the coastal definitions used here. Tidal connection matters.
What should a funder screenshot?
Hydroperiod, species list, monitoring years, and the field kit’s live Wh if the budget includes sensors.
If you are comparing field or household energy hardware after this desk check, open the live partner listing for Traverseon field gear and read the nameplate Wh or kWh on that page. Do not treat the listing as a FoxyEco lab result.