What is a blue carbon ecosystem and why are they important?

Blue carbon ecosystems, including mangroves, seagrass meadows, and salt marshes, are critical natural climate solutions that sequester over 50% of global ocean carbon despite covering only 0.5% of the sea floor. These habitats support 3 billion people through food security and protection from extreme weather, yet they face severe degradation, with 67% of mangroves already lost or degraded. Protecting these ecosystems could prevent 304 Tg of carbon dioxide emissions annually, while restoration could sequester an additional 841 Tg, totaling approximately 3% of annual global GHG emissions. However, as of 2023, only 61 of 151 countries with these habitats included their conservation in their Nationally Determined Contributions (NDCs).

• Blue carbon ecosystems, comprising seagrass meadows, mangroves, and salt marshes, are highly efficient carbon sinks; while they cover only about 0.5% of the sea floor, they are responsible for more than 50% of the carbon sequestration occurring in the global oceans.
• These ecosystems provide essential socio-economic and ecological services, supporting the food security and livelihoods of over 3 billion people and offering protection against coastal erosion, floods, and storms.
• Blue carbon habitats are under severe threat from urban and agricultural conversion, pollution, and overfishing, with 67% of mangroves already degraded or lost. This degradation releases stored carbon back into the atmosphere, creating a cycle where climate change further damages these systems via ocean acidification and sea level rise.
• Conservation and restoration of blue carbon ecosystems offer significant mitigation potential, potentially preventing 304 Tg of carbon dioxide emissions per year and sequestering an additional 841 Tg, which represents roughly 3% of annual global greenhouse gas emissions.
• There is a gap in international policy integration; by 2023, only 61 of the 151 countries possessing these coastal habitats had incorporated their conservation and restoration into their Nationally Determined Contributions (NDCs).

APA

Contributor, C. (2025). What is a blue carbon ecosystem and why are they important? ClimaTalk. https://climatalk.org/2025/03/16/blue-carbon-ecosystems-an-introduction/

Chicago

Contributor, ClimaTalk. What is a blue carbon ecosystem and why are they important? ClimaTalk, 2025. https://climatalk.org/2025/03/16/blue-carbon-ecosystems-an-introduction/.

Wikipedia

{{cite report |last1=Contributor |first1=ClimaTalk |title=What is a blue carbon ecosystem and why are they important? |publisher=ClimaTalk |date=16 March 2025 |url=https://climatalk.org/2025/03/16/blue-carbon-ecosystems-an-introduction/ |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{contributor2025what, author = {Contributor, ClimaTalk}, title = {{What is a blue carbon ecosystem and why are they important?}}, institution = {ClimaTalk}, year = {2025}, month = mar, url = {https://climatalk.org/2025/03/16/blue-carbon-ecosystems-an-introduction/}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }