Mangroves, tidal marshes and seagrass meadows can store carbon in biomass and sediment, but a large stock is not the same quantity as an annual removal or a saleable credit.
Converting carbon to carbon dioxide equivalent uses molecular mass: 1 tonne C equals about 3.67 tonnes CO₂. The conversion does not resolve whether the carbon is additional or durable.
Aboveground biomass may be estimated from field measurements and species-specific allometry. Sediment carbon requires cores, depth intervals, bulk density and carbon concentration. Extrapolation also needs a mapped habitat boundary and uncertainty. A shallow core cannot establish the full sediment stock.
Editorial evidence diagram; bar lengths are not measurements.
A project can deliver habitat, shoreline and water-quality benefits even when a carbon credit is not justified. Crediting additionally asks whether the change exceeds the baseline, whether activity shifts elsewhere, how reversal risk is handled and whether methane or nitrous oxide materially changes the greenhouse-gas balance.
A report lists 250 Mg C ha−1 across 40 ha. The arithmetic stock is 10,000 Mg C, or about 36,700 Mg CO₂ equivalent. Explain why this number alone is neither an annual sequestration rate nor a credit quantity.
This page does not validate any project, registry methodology or offset.
Ocean field notebook / discoveries
Mangroves, tidal marshes and seagrass meadows can store carbon in biomass and sediment, but a large stock is not the same quantity as an annual removal or a saleable credit.
Distinguish standing biomass from long-term storage, and habitat extent from habitat condition, before interpreting ecological or climate value. Relate that field focus to “Four quantities answer different questions” before moving to “Measure the pool before scaling it.”
Pair a time series with an explicit baseline with a second measurement of the same process. Record depth, location, date, units and sampling effort so a change in conditions is not mistaken for a change in the ocean.
Compare “Measure the pool before scaling it” with “Restoration is not automatically a carbon credit.” Decide whether the pattern represents exposure, response or recovery, and state the observation period needed to tell them apart.