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🌊 Blue Carbon: How Coastal Wetlands Store Carbon

Follow carbon through marshes, mangroves, and seagrass—from plant growth and tidal export to buried soil, disturbance, restoration, and honest climate accounting.

5
lessons
~10 min
to learn
🔬 Science
subject
Adults
level
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What you’ll learn

  1. Carbon enters a coastal wetlandDistinguish carbon capture, sequestration, storage, and tidal export in coastal wetlands.Plants capture carbon, but its climate significance depends on whether it is stored, exported, or returned to the atmosphere.
  2. Soil keeps a long carbon recordExplain how saturation, roots, sediment, elevation, and cores shape long-term wetland carbon storage.Waterlogged soils and accumulating sediment can preserve carbon, while elevation and disturbance control whether that storage continues.
  3. Different habitats store carbon differentlyCompare carbon pathways in mangroves, seagrasses, and salt marshes while accounting for greenhouse gases.Different blue-carbon habitats combine biomass, roots, sediment, and water chemistry in distinct carbon budgets.
  4. Disturbance can reverse storagePredict how drainage, development, storms, and loss of wetland area can change carbon flows.Disturbance can expose, erode, or relocate stored carbon and alter future plant inputs and greenhouse-gas emissions.
  5. Protection and restoration keep carbon workingEvaluate blue-carbon protection and restoration claims using mechanisms, boundaries, baselines, and uncertainty.Durable carbon benefits require functioning hydrology, migration space, safeguards, and measurements that test the full budget.

Questions this course answers

Which statement correctly separates sequestration from storage?

A rate describes how quickly carbon is taken up, while a stock describes how much carbon is held in a defined pool.

Why can waterlogged wetland soils preserve organic carbon for long periods?

Saturated soils often have little oxygen below the surface, which changes and can slow decomposition, though it does not stop all greenhouse-gas production.

Put a credible blue-carbon restoration assessment in order.

A test needs a prediction, a baseline and comparison, an intervention, and follow-up measurements.

Grounded in trusted sources

  • NOAA National Ocean Service, Coastal Blue Carbon, https://oceanservice.noaa.gov/ecosystems/coastal-blue-carbon/
  • NOAA National Ocean Service, What is Blue Carbon?, https://oceanservice.noaa.gov/facts/bluecarbon.html
  • U.S. Geological Survey, Blue Carbon, https://www.usgs.gov/science/science-explorer/climate/blue-carbon
  • U.S. Environmental Protection Agency, About Coastal Wetlands, https://www.epa.gov/wetlands/about-coastal-wetlands
  • NOAA National Centers for Coastal Ocean Science, Assessing Blue Carbon Storage at Restoration Sites of Various Ages and Morphologies, https://coastalscience.noaa.gov/project/assessing-blue-carbon-storage-at-sites-restored-through-beneficial-use-of-dredged-sediment/
  • NOAA Office of National Marine Sanctuaries, Storing Blue Carbon, https://sanctuaries.noaa.gov/magazine/6/storing-blue-carbon.html

Every Wunder lesson is built from real, reputable sources — never invented.

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