New brief: Capturing and Conserving Natural Coastal Carbon–Building mitigation, advancing adaptation

The World Bank, together with IUCN and ESA PWA, announced the release of a brief for decision-makers entitled, “Capturing and Conserving Natural Coastal Carbon – Building mitigation, advancing adaptation.” This information brief highlights the crucial importance of carbon sequestered in coastal wetlands and submerged vegetated habitats like seagrass beds for climate change mitigation.

Coastal wetlands, such as mangroves, tidal flats and salt marshes, along with seagrass beds sequester large amounts of carbon within their plants and especially in the soil. However, degradation of these habitats–as a result of drainage, conversion and reclamation–can result in substantial and ongoing emissions of greenhouse gases.

However, these natural carbon sinks and the emissions resulting from their degradation and loss remain largely unaccounted for within the UNFCCC. Restoring degraded wetlands–in particular deltas which are subsiding as a result of natural geomorphology, human disturbance to the hydrological cycle, and sea level rise–can reverse the loss of these sinks and reverse the release of GHGs to the atmosphere. Protecting these natural carbon stores in the first place prevents the rapid loss of carbon that immediately follows disturbance, as well and preserving has substantial co-benefits for adaptation to climate change in terms of reducing the physical vulnerability of shorelines and increasing the social and economic resilience of coastal communities through positive impacts on livelihoods and food security.

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