Blue carbon

Short description: Carbon stored in coastal and marine ecosystems

Ways one blue carbon habitat can influence carbon processing in an adjacent blue carbon habitat [1]

Blue carbon is a term used in the climate change mitigation context that refers to "biologically driven carbon fluxes and storage in marine systems that are amenable to management."[2]: 2220 Most commonly, it refers to the role that tidal marshes, mangroves and seagrasses can play in carbon sequestration.[2]: 2220 Such ecosystems can contribute to climate change mitigation and also to ecosystem-based adaptation. When blue carbon ecosystems are degraded or lost they release carbon back to the atmosphere.[2]: 2220

Blue carbon management methods can be grouped into ocean-based biological carbon dioxide removal (CDR) methods.[3]: 764 They are a type of biologic carbon sequestration.

There is increasing interest in developing blue carbon potential.[4] Research is ongoing. In some cases it has been found that these types of ecosystems can remove carbon at a rate ten times greater than mature tropical forests.[5] However, the long-term effectiveness of blue carbon as a carbon dioxide removal solution remains contested.[6][4][7] The term deep blue carbon is also in use and includes efforts to store carbon in the deep ocean waters.[8]

## Contents

* 1 Definition
* 2 Role in climate change context
* 2.1 Impacts of nutrient load
* 3 Contribution to carbon storage
* 3.1 Tidal marshes
* 3.2 Mangroves
* 3.3 Seagrass
* 3.4 Deep ocean
* 4 Example projects
* 5 See also
* 6 References
* 7 External links

## Definition

Blue carbon is defined by the IPCC as: "Biologically driven carbon fluxes and storage in marine systems that are amenable to management."[2]: 2220

Another definition states: "Blue carbon refers to organic carbon that is captured and stored by the oceans and coastal ecosystems, particularly by vegetated coastal ecosystems: seagrass meadows, tidal marshes, and mangrove forests."[9]

Coastal blue carbon focuses on "rooted vegetation in the coastal zone, such as tidal marshes, mangroves and seagrasses". Seagrass, salt marshes and mangroves are sometimes referred to as "blue forests" in contrast to land-based "green forests".[10][11]

Deep blue carbon is located in the high seas beyond national jurisdictions.[12] It includes carbon contained in "continental shelf waters, deep-sea waters and the sea floor beneath them" and makes up 90% of all ocean carbon.[13] Deep blue carbon is generally seen as "less amenable to management" and challenging due to lack of data "relating to the permanence of their carbon stores".[3]: 764

## Role in climate change context

The term blue carbon was coined in 2009.[14][9] At the time, the term was coined to highlight that coastal vegetated ecosystems have a disproportionately large contribution to global carbon sequestration.[9] Others use the term to describe the carbon captured by the entire ocean, not just the coastal ecosystems.[15] The role of blue carbon in climate change mitigation and adaptation has now reached international prominence.[9]

The vegetated coastal ecosystems of tidal marshes, mangroves and seagrasses (which are grouped as "blue carbon") have high carbon burial rates. This is because they accumulate carbon in their soils and sediments.[2]: 2220

Such ecosystems can contribute to climate change mitigation and also to ecosystem-based adaptation. However, when coastal blue carbon ecosystems are degraded or lost they release carbon back to the atmosphere.[2]: 2220

Mangroves, salt marshes and seagrasses can store carbon and are highly efficient carbon sinks. They capture CO
2 from the atmosphere by sequestering the carbon in their underlying sediments, in underground and below-ground biomass, and in dead biomass.[16]

Although vegetated coastal ecosystems cover less area and have less aboveground biomass than terrestrial plants they have the potential to impact long term C sequestration, particularly in sediment sinks.[17]

One of the main concerns with blue carbon is that the rate of loss of these important marine ecosystems is much higher than any other ecosystem on the planet, even compared to rainforests. Current estimates suggest a loss of 2-7% per year, which is not only lost carbon sequestration, but also lost habitat that is important for managing climate, coastal protection, and health.[17]

Estimates of the economic value of blue carbon ecosystems per hectare. Based on 2009 data from UNEP/GRID-Arendal.[18][19]

As habitats that sequester carbon are altered and decreased, that stored amount of C is being released into the atmosphere, continuing the current accelerated rate of climate change. Impacts on these habitats globally will directly and indirectly release the previously stored carbon, which had been sequestered in the sediments of these habitats. Declines in vegetated coastal habitats are seen worldwide.

Quantifying rates of decrease are difficult to calculate, however measurements have been estimated by researchers indicating that if blue carbon ecosystems continue to decline, for any number of reasons, 30-40% of tidal marshes and seagrasses and approximately 100% of mangroves could be gone in the next century.[20]

Reasons for the decline of mangroves, seagrass, and marshes include land use changes, climate and drought related effects, dams built in the watershed, convergence to aquaculture and agriculture, land development and sea-level rise due to climate change. Increases in these activities can lead to significant decreases in habitat availability and thus increases in released C from sediments.

As anthropogenic effects and climate change are heightened, the effectiveness of blue carbon sinks will diminish and CO2 emissions will be further increased. Data on the rates at which CO2 is being released into the atmosphere is not robust currently; however, research is being conducted to gather better information to analyze trends. Loss of underground biomass (roots and rhizomes) will allow for CO2 to be emitted changing these habitats into sources rather than carbon sinks.[21]

### Impacts of nutrient load

Increases in carbon capture and sequestration have been observed in both mangrove and seagrass ecosystems which have been subjected to high nutrient loads, either intentionally or due to waste from human activities.[22]

Research done on mangrove soils from the Red Sea have shown that increases in nutrient loads to these soils do not increase carbon mineralization and subsequent CO2 release.[23] This neutral effect of fertilization was not found to be true in all mangrove forest types. Carbon capture rates also increased in these forests due to increased growth rates of the mangroves. In forests with increases in respiration there were also increases in mangrove growth of up to six times the normal rate.[24]

## Contribution to carbon storage

### Tidal marshes

Tidal marsh

Marshes, intertidal ecosystems dominated by herbaceous vegetation, can be found globally on coastlines from the arctic to the subtropics. In the tropics, marshes are replaced by mangroves as the dominant coastal vegetation.[25]

Marshes have high productivity, with a large portion of primary production in belowground biomass.[25] This belowground biomass can form deposits up to 8m deep.[25] Marshes provide valuable habitat for plants, birds, and juvenile fish, protect coastal habitat from storm surge and flooding, and can reduce nutrient loading to coastal waters.[26] Similarly to mangrove and seagrass habitats, marshes also serve as important carbon sinks.[27] Marshes sequester C in underground biomass due to high rates of organic sedimentation and anaerobic-dominated decomposition.[27] Salt marshes cover approximately 22,000 to 400,000 km2 globally, with an estimated carbon burial rate of 210 g C m−2 yr−1.[25]

Salt marshes may not be expansive worldwide in relation to forests, but they have a C burial rate that is over 50 times faster than tropical rainforests. Rates of burial have been estimated at up to 87.2 ± 9.6 Tg C yr−1 which is greater than that of tropical rainforests, 53 ± 9.6 Tg C yr−1.[21] Since the 1800s salt marshes have been disturbed due to development and a lack of understanding of their importance. The 25% decline since that time has led to a decrease in potential C sink area coupled with the release of once buried C. Consequences of increasingly degraded marsh habitat are a decrease in C stock in sediments, a decrease in plant biomass and thus a decrease in photosynthesis reducing the amount of CO2 taken up by the plants, failure of C in plant blades to be transferred into the sediment, possible acceleration of erosive processes due to the lack of plant biomass, and acceleration of buried C release to the atmosphere.[21]

Tidal marshes have been impacted by humans for centuries, including modification for grazing, haymaking, reclamation for agriculture, development and ports, evaporation ponds for salt production, modification for aquaculture, insect control, tidal power and flood protection.[28] Marshes are also susceptible to pollution from oil, industrial chemicals, and most commonly, eutrophication. Introduced species, sea-level rise, river damming and decreased sedimentation are additional longterm changes that affect marsh habitat, and in turn, may affect carbon sequestration potential.[29]

### Mangroves

Further information: Biology:Mangrove restoration

Mangrove forest

Globally, mangroves stored 4.19 ± 0.62 Pg (CI 95%) of carbon in 2012, with Indonesia, Brazil, Malaysia and Papua New Guinea accounting for more than 50% of the global stock.[30] 2.96 ± 0.53 Pg of the global carbon stock is contained within the soil and 1.23 ± 0.06 Pg in the living biomass.[30] Of this 1.23 Pg, approximately 0.41 ± 0.02 Pg is in the belowground biomass in the root system and approximately 0.82 ± 0.04 Pg is in the aboveground living biomass.[30]

Global mangrove canopy cover is estimated as between 83,495 km2 and 167,387 km2 in 2012 with Indonesia containing approximately 30% of the entire global mangrove forest area.[31] Mangrove forests are responsible for approximately 10% of global carbon burial,[32] with an estimated carbon burial rate of 174 g C m−2 yr−1.[33]

Mangroves, like seagrasses, have potential for high levels of carbon sequestration. They account for 3% of the global carbon sequestration by tropical forests and 14% of the global coastal ocean's carbon burial.[34]

Mangroves are naturally disturbed by floods, tsunamis, coastal storms like cyclones and hurricanes, lightning, disease and pests, and changes in water quality or temperature.[33] Although they are resilient to many of these natural disturbances, they are highly susceptible to human impacts including urban development, aquaculture, mining, and overexploitation of shellfish, crustaceans, fish and timber.[35][33] Mangroves provide globally important ecosystem services and carbon sequestration and are thus an important habitat to conserve and repair when possible.[36][37]

Dams threaten habitats by slowing the amount of freshwater reaching mangroves. Coral reef destruction also plays a role in mangrove habitat health as reefs slow wave energy to a level that mangroves are more tolerant of.

### Seagrass

Main article: Biology:Seagrass

Seagrass meadow

(A) untrawled seamount and (B) a trawled seamount. Bottom trawling has destroyed many coastal habitats.

Although seagrass makes up only 0.1% of the area of the ocean floor, it accounts for approximately 10–18% of the total oceanic carbon burial.[38] Currently global seagrass meadows are estimated to store as much as 19.9 Pg (gigaton, or billion tons) of organic carbon.[38] There has been considerable attention to how large-scale seaweed cultivation in the open ocean can act as a form of carbon sequestration.[39][40] Studies have demonstrated that nearshore seaweed forests constitute a source of blue carbon, as seaweed detritus is carried by wave currents into the middle and deep ocean thereby sequestering carbon.[39][41][42][43]

Carbon primarily accumulates in marine sediments, which are anoxic and thus continually preserve organic carbon from decadal-millennial time scales. High accumulation rates, low oxygen, low sediment conductivity and slower microbial decomposition rates all encourage carbon burial and carbon accumulation in these coastal sediments.[44]

Compared to terrestrial habitats that lose carbon stocks as CO2 during decomposition or by disturbances like fires or deforestation, marine carbon sinks can retain C for much longer time periods. Carbon sequestration rates in seagrass meadows vary depending on the species, characteristics of the sediment, and depth of the habitats, but on average the carbon burial rate is approximately 138 g C m−2 yr−1.[45]

Seagrass habitats are threatened by coastal eutrophication, increased seawater temperatures,[44] increased sedimentation and coastal development,[45] and sea level rise which may decrease light availability for photosynthesis. Seagrass loss has accelerated over the past few decades, from 0.9% per year prior to 1940 to 7% per year in 1990, with about 1/3 of global loss since WWII.[46] The decline in seagrasses is due to a number of factors including drought, water quality issues, agricultural practices, invasive species, pathogens, fishing and climate change.[47]

Scientists encourage the protection and continued research of these ecosystems for organic carbon storage, valuable habitat and other ecosystem services.

Restored seagrass meadows were found to start sequestering carbon in sediment within about four years. This was the time needed for the meadow to reach sufficient shoot density to cause sediment deposition.[48]

### Deep ocean

Blue Carbon at coastal, medium and deep ocean levels.[49]

The deeper layers of the ocean are greatly unsaturated in CO2 and its dissolved forms, carbonic and bicarbonic acid, and their salts.[50] At depths greater than 3 km, CO2 becomes liquefied and sinks to the seafloor due to it being higher density than the surrounding seawater. Mathematical models have shown that CO2 stored in deep sea sediments beyond 3 km could provide permanent geological storage[51] even with large geomechanical perturbations. Deep ocean storage can present a potential sink for large amounts of anthropogenic CO2.[52] Other deep water carbon storage techniques currently being explored include, seaweed farming and algae, ocean fertilization, artificial upwelling, and basalt storage.

The deep blue carbon terminology has been used in passing as early as 2017.[53] The Ocean Frontier Institute has made it a centrepiece of their participation at COP27.[54] It is investing significant resources into deep blue carbon research.[55] In terms of net-new-carbon sequestration deep blue carbon offers an estimated 10-20 times higher potential than coastal blue carbon to achieve net-zero goals.[56] There is still a lack of data in this area along with financial, ecological and environmental concerns.[55] Advancements in research and technical capabilities are raising international interest in this kind of storage.[57][12][58]

## Example projects

* Microsoft and Running Tide signed Two-Year agreement in 2023 to remove up to 12,000 tons of carbon through an ocean-based carbon removal system.[59]
* In Canada, a North Atlantic Carbon Observatory (NACO) project is underway to establish an accurate measurement of the ocean's ability to continue to absorb carbon with particular emphasis on deep blue capacity.[60][61]
* In Denmark, the "Greensand" project is underway to capture carbon at source and deposit it in the deep blue regions of the North Sea, creating a 'CO2 graveyard'. The project is expected to store up to eight million tonnes of CO2 per year by 2030.[62]
* A restoration project in South Australia will cover 2,000 ha (4,900 acres) of mangroves, salt marsh and sea grasses extending 700 km (430 mi) in the St Vincents Gulf and Spencer Gulf in South Australia. The project will also look at various possibilities of insuring the huge expanse of existing blue carbon ecosystems.[63]
* In South Korea, macroalgae have been utilized as part of a climate change mitigation program. The country has established the Coastal CO2 Removal Belt (CCRB) which is composed of artificial and natural ecosystems. The goal is to capture carbon using large areas of kelp forest.[64]
* Marine permaculture also fixes carbon in seaweed forest projects offshore in Tasmania and the Philippines, with potential use from the tropics to temperate oceans.[65]

## See also

* Ocean Data Viewer: contains datasets on worldwide sea grasses, mangroves and salt marshes
* UN Decade for Ocean Science for Sustainable Development
* UN Decade on Ecosystem Restoration

## References

1. ↑ Huxham, M.; Whitlock, D.; Githaiga, M.; Dencer-Brown, A. (2018). "Carbon in the Coastal Seascape: How Interactions Between Mangrove Forests, Seagrass Meadows and Tidal Marshes Influence Carbon Storage". Current Forestry Reports 4 (2): 101–110. doi:10.1007/s40725-018-0077-4. 50px Material was copied from this source, which is available under a Creative Commons Attribution 4.0 International License .
2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 IPCC, 2021: Annex VII: Glossary [Matthews, J.B.R., V. Möller, R. van Diemen, J.S. Fuglestvedt, V. Masson-Delmotte, C. Méndez, S. Semenov, A. Reisinger (eds.)]. In Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change [Masson-Delmotte, V., P. Zhai, A. Pirani, S.L. Connors, C. Péan, S. Berger, N. Caud, Y. Chen, L. Goldfarb, M.I. Gomis, M. Huang, K. Leitzell, E. Lonnoy, J.B.R. Matthews, T.K. Maycock, T. Waterfield, O. Yelekçi, R. Yu, and B. Zhou (eds.)]. Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, pp. 2215–2256, doi:10.1017/9781009157896.022.
3. ↑ 3.0 3.1 Canadell, J.G., P.M.S. Monteiro, M.H. Costa, L. Cotrim da Cunha, P.M. Cox, A.V. Eliseev, S. Henson, M. Ishii, S. Jaccard, C. Koven, A. Lohila, P.K. Patra, S. Piao, J. Rogelj, S. Syampungani, S. Zaehle, and K. Zickfeld, 2021: Chapter 5: Global Carbon and other Biogeochemical Cycles and Feedbacks. In Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change [Masson-Delmotte, V., P. Zhai, A. Pirani, S.L. Connors, C. Péan, S. Berger, N. Caud, Y. Chen, L. Goldfarb, M.I. Gomis, M. Huang, K. Leitzell, E. Lonnoy, J.B.R. Matthews, T.K. Maycock, T. Waterfield, O. Yelekçi, R. Yu, and B. Zhou (eds.)]. Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, pp. 673–816, doi: 10.1017/9781009157896.007.
4. ↑ 4.0 4.1 Ricart, Aurora M.; Krause-Jensen, Dorte; Hancke, Kasper; Price, Nichole N.; Masqué, Pere; Duarte, Carlos M. (2022). "Sinking seaweed in the deep ocean for carbon neutrality is ahead of science and beyond the ethics". Environmental Research Letters 17 (8): 081003. doi:10.1088/1748-9326/ac82ff. Bibcode: 2022ERL....17h1003R.
5. ↑ "Coastal Blue Carbon" (in EN-US). https://oceanservice.noaa.gov/ecosystems/coastal-blue-carbon/#:~:text=Current studies suggest that mangroves,equivalent area than tropical forests..
6. ↑ Hurd, Catriona L.; Law, Cliff S.; Bach, Lennart T.; Britton, Damon; Hovenden, Mark; Paine, Ellie R.; Raven, John A.; Tamsitt, Veronica et al. (2022). "Forensic carbon accounting: Assessing the role of seaweeds for carbon sequestration". Journal of Phycology 58 (3): 347–363. doi:10.1111/jpy.13249. PMID 35286717.
7. ↑ Boyd, Philip W.; Bach, Lennart T.; Hurd, Catriona L.; Paine, Ellie; Raven, John A.; Tamsitt, Veronica (2022). "Potential negative effects of ocean afforestation on offshore ecosystems". Nature Ecology & Evolution 6 (6): 675–683. doi:10.1038/s41559-022-01722-1. PMID 35449458.
8. ↑ CarbonBetter (2022-11-04). "What Is Blue Carbon?" (in en). https://carbonbetter.com/story/blue-carbon/.
9. ↑ 9.0 9.1 9.2 9.3 Macreadie, Peter I.; Anton, Andrea; Raven, John A.; Beaumont, Nicola; Connolly, Rod M.; Friess, Daniel A.; Kelleway, Jeffrey J.; Kennedy, Hilary et al. (2019). "The future of Blue Carbon science" (in en). Nature Communications 10 (1): 3998. doi:10.1038/s41467-019-11693-w. ISSN 2041-1723. PMID 31488846. Bibcode: 2019NatCo..10.3998M. Text was copied from this source, which is available under a Creative Commons Attribution 4.0 International License
10. ↑ "Blue Forests: Finding Coastal and Marine Solutions to meet the Paris Agreement". 13 Apr 2017. https://www.unep.org/news-and-stories/story/blue-forests-finding-coastal-and-marine-solutions-meet-paris-agreement.
11. ↑ Twilley, Robert; Rovai, Andre (January 15, 2019). "Why protecting 'blue carbon' storage is crucial to fighting climate change". GreenBiz. https://www.greenbiz.com/article/why-protecting-blue-carbon-storage-crucial-fighting-climate-change.
12. ↑ 12.0 12.1 "Deep Blue Carbon". https://www.ofi.ca/impact/policy/deep-blue-carbon.
13. ↑ "Advancing responsible deep blue carbon: a business strategist perspective" (in en-gb). https://impact.economist.com/ocean/ocean-and-climate/advancing-responsible-deep-blue-carbon-a-business-strategist-perspective.
14. ↑ Cathrine E., Lovelock; Duarte, Carlos M. (2019). "Dimensions of Blue Carbon and emerging perspectives". Biology Letters 15 (3): 20180781. doi:10.1098/rsbl.2018.0781. PMID 30836882.
15. ↑ "What is Blue Carbon?". https://oceanservice.noaa.gov/facts/bluecarbon.html.
16. ↑ National Academies of Sciences, Engineering, and Medicine (2019). "Coastal Blue Carbon" (in en). Negative Emissions Technologies and Reliable Sequestration: A Research Agenda. pp. 45–48. doi:10.17226/25259. ISBN 978-0-309-48452-7. https://www.nap.edu/catalog/25259. Retrieved 2020-02-21.
17. ↑ 17.0 17.1 Nelleman, C.. "Blue carbon: the role of healthy oceans in binding carbon.". http://www.grida.no/files/publications/blue-carbon/BlueCarbon_screen.pdf.
18. ↑ Nellemann, Christian et al. (2009): Blue Carbon. The Role of Healthy Oceans in Binding Carbon. A Rapid Response Assessment. Arendal, Norway: UNEP/GRID-Arendal
19. ↑ Macreadie, P.I., Anton, A., Raven, J.A., Beaumont, N., Connolly, R.M., Friess, D.A., Kelleway, J.J., Kennedy, H., Kuwae, T., Lavery, P.S. and Lovelock, C.E. (2019) "The future of Blue Carbon science". Nature communications, 10(1): 1–13. doi:10.1038/s41467-019-11693-w.
20. ↑ Pendleton, Linwood; Donato, Daniel C.; Murray, Brian C.; Crooks, Stephen; Jenkins, W. Aaron; Sifleet, Samantha; Craft, Christopher; Fourqurean, James W. et al. (2012). "Estimating Global "Blue Carbon" Emissions from Conversion and Degradation of Vegetated Coastal Ecosystems". PLOS ONE 7 (9): e43542. doi:10.1371/journal.pone.0043542. PMID 22962585. Bibcode: 2012PLoSO...743542P.
21. ↑ 21.0 21.1 21.2 Macreadie, Peter I.; Hughes, A. Randall; Kimbro, David L. (2013). "Loss of 'Blue Carbon' from Coastal Salt Marshes Following Habitat Disturbance". PLOS ONE 8 (7): e69244. doi:10.1371/journal.pone.0069244. PMID 23861964. Bibcode: 2013PLoSO...869244M.
22. ↑ Kumar, K.; Banerjee, D.; Das, D. (2014). "Carbon dioxide sequestration from industrial flue gas by Chlorella sorokiniana". Bioresource Technology 152: 225–233. doi:10.1016/j.biortech.2013.10.098. PMID 24292202.
23. ↑ Keuskamp, J. A.; Schmitt, H.; Laanbroek, H. J.; Verhoeven, J. T.; Hefting, M. M. (2013). "Nutrient amendment does not increase mineralisation of sequestered carbon during incubation of a nitrogen limited mangrove soil". Soil Biology and Biochemistry 57: 822–829. doi:10.1016/j.soilbio.2012.08.007. https://pure.knaw.nl/portal/en/publications/nutrient-amendment-does-not-increase-mineralisation-of-sequestered-carbon-during-incubation-of-a-nitrogenlimited-mangrove-soil(d8918399-488b-4f7e-8289-177bd6bffe5c).html. Retrieved 2020-05-11.
24. ↑ Mcleod, E.; Chmura, G. L.; Bouillon, S.; Salm, R.; Björk, M.; Duarte, C. M.; Silliman, B. R. (2011). "A blueprint for blue carbon: toward an improved understanding of the role of vegetated coastal habitats in sequestering CO
2". Frontiers in Ecology and the Environment 9 (10): 552–560. doi:10.1890/110004. https://espace.library.uq.edu.au/view/UQ:251863/UQ251863_OA.pdf. Retrieved 2019-09-30.CO2&rft.jtitle=Frontiers+in+Ecology+and+the+Environment&rft.aulast=Mcleod&rft.aufirst=E.&rft.au=Mcleod, E.&rft.au=Chmura, G.+L.&rft.au=Bouillon, S.&rft.au=Salm, R.&rft.au=Björk, M.&rft.au=Duarte, C.+M.&rft.au=Silliman, B.+R.&rft.date=2011&rft.volume=9&rft.issue=10&rft.pages=552–560&rft_id=info:doi/10.1890/110004&rft_id=https://espace.library.uq.edu.au/view/UQ:251863/UQ251863_OA.pdf&rfr_id=info:sid/en.wikibooks.org:Earth:Blue_carbon">
25. ↑ 25.0 25.1 25.2 25.3 Chmura, Gail; Anisfield, Shimon (2003). "Global carbon sequestration in tidal, saline wetland soils". Global Biogeochemical Cycles 17 (4): n/a. doi:10.1029/2002GB001917. Bibcode: 2003GBioC..17.1111C.
26. ↑ Chmura, Gail L (2013). "What do we need to assess the sustainability of the tidal salt marsh carbon sink?". Ocean and Coastal Management 83: 25–31. doi:10.1016/j.ocecoaman.2011.09.006. Bibcode: 2013OCM....83...25C.
27. ↑ 27.0 27.1 Mudd, Simon, M. (2009). "Impact of dynamic feedbacks between sedimentation, sea-level rise, and biomass production on near-surface marsh stratigraphy and carbon accumulation". Estuarine, Coastal and Shelf Science 82 (3): 377–389. doi:10.1016/j.ecss.2009.01.028. Bibcode: 2009ECSS...82..377M.
28. ↑ Adam, Paul (2002). "Saltmarshes in a time of change". Environmental Conservation 29: 39–61. doi:10.1017/S0376892902000048.
29. ↑ Fourqurean, James W.; Zieman, Joseph C. (2002). "Nutrient Content of the Seagrass Thalassia Testudinum Reveals Regional Patterns of Relative Availability of Nitrogen and Phosphorus in the Florida Keys USA". Biogeochemistry 61 (3): 229–45. doi:10.1023/A:1020293503405.
30. ↑ 30.0 30.1 30.2 Hamilton, Stuart E.; Friess, Daniel A. (2018-02-26). "Global carbon stocks and potential emissions due to mangrove deforestation from 2000 to 2012". Nature Climate Change 8 (3): 240–244. doi:10.1038/s41558-018-0090-4. ISSN 1758-678X. Bibcode: 2018NatCC...8..240H.
31. ↑ Hamilton, Stuart E.; Casey, Daniel (2016-03-21). "Creation of a high spatio-temporal resolution global database of continuous mangrove forest cover for the 21st century (CGMFC-21)" (in en). Global Ecology and Biogeography 25 (6): 729–738. doi:10.1111/geb.12449. ISSN 1466-822X.
32. ↑ Duarte, C.M. (2005). "Major rule of marine vegetation on the oceanic carbon cycle". Biogeosciences 2 (1): 1–8. doi:10.5194/bg-2-1-2005. Bibcode: 2005BGeo....2....1D. https://hal.inria.fr/file/index/docid/297509/filename/bg-2-1-2005.pdf. Retrieved 2016-03-02.
33. ↑ 33.0 33.1 33.2 Alongi, DM (2002). "Present state and future of the world's mangrove forests". Environmental Conservation 29 (3): 331–349. doi:10.1017/S0376892902000231. http://faculty.washington.edu/timbillo/Readings and documents/CO2 and Forests readings/mangroves CO2.pdf. Retrieved 2016-03-02.
34. ↑ Alongi, Daniel M (2012). "Carbon sequestration in mangrove forests". Future Science. https://www.researchgate.net/publication/274116107. Retrieved 2019-07-26.
35. ↑ Spaulding, MD (2010). "World atlas of mangroves". https://www.cbd.int/cooperation/pavilion/nagoya-presentations/2010-10-21-session1-mangroves-en.pdf.
36. ↑ Zimmer, Katarina (22 July 2021). "Many mangrove restorations fail. Is there a better way?". Knowable Magazine. doi:10.1146/knowable-072221-1. https://knowablemagazine.org/article/food-environment/2021/many-mangrove-restorations-fail. Retrieved 11 August 2021.
37. ↑ Friess, Daniel A.; Rogers, Kerrylee; Lovelock, Catherine E.; Krauss, Ken W.; Hamilton, Stuart E.; Lee, Shing Yip; Lucas, Richard; Primavera, Jurgenne et al. (17 October 2019). "The State of the World's Mangrove Forests: Past, Present, and Future". Annual Review of Environment and Resources 44 (1): 89–115. doi:10.1146/annurev-environ-101718-033302.
38. ↑ 38.0 38.1 Fourqurean, James W. (2012). "Seagrass ecosystems as a globally significant carbon stock". Nature Geoscience 5 (7): 505–509. doi:10.1038/ngeo1477. Bibcode: 2012NatGe...5..505F.
39. ↑ 39.0 39.1 Duarte, Carlos M.; Wu, Jiaping; Xiao, Xi; Bruhn, Annette; Krause-Jensen, Dorte (2017). "Can Seaweed Farming Play a Role in Climate Change Mitigation and Adaptation?". Frontiers in Marine Science 4: 100. doi:10.3389/fmars.2017.00100. ISSN 2296-7745.
40. ↑ Temple, James (2021-09-19). "Companies hoping to grow carbon-sucking kelp may be rushing ahead of the science" (in en). https://www.technologyreview.com/2021/09/19/1035889/kelp-carbon-removal-seaweed-sinking-climate-change/.
41. ↑ Wernberg, Thomas; Filbee-Dexter, Karen (2018-11-21). "Grazers extend blue carbon transfer by slowing sinking speeds of kelp detritus". Scientific Reports 8 (1): 17180. doi:10.1038/s41598-018-34721-z. ISSN 2045-2322. PMID 30464260. Bibcode: 2018NatSR...817180W.
42. ↑ Berg, Peter; Delgard, Marie Lise; Polsenaere, Pierre; McGlathery, Karen J.; Doney, Scott C.; Berger, Amelie C. (2019-06-24). "Dynamics of benthic metabolism, O 2 , and pCO 2 in a temperate seagrass meadow" (in en). Limnology and Oceanography 64 (6): 2586–2604. doi:10.1002/lno.11236. ISSN 0024-3590. Bibcode: 2019LimOc..64.2586B. https://onlinelibrary.wiley.com/doi/10.1002/lno.11236.
43. ↑ Pessarrodona, Albert; Franco‐Santos, Rita M.; Wright, Luka Seamus; Vanderklift, Mathew A.; Howard, Jennifer; Pidgeon, Emily; Wernberg, Thomas; Filbee‐Dexter, Karen (December 2023). "Carbon sequestration and climate change mitigation using macroalgae: a state of knowledge review" (in en). Biological Reviews 98 (6): 1945–1971. doi:10.1111/brv.12990. ISSN 1464-7931. https://onlinelibrary.wiley.com/doi/10.1111/brv.12990.
44. ↑ 44.0 44.1 Duarte, CM (2011). "Assessing the capacity of seagrass meadows for carbon burial: current limitations and future strategies.". Ocean Coastal Management.
45. ↑ 45.0 45.1 McLeod, E.. "A blueprint for blue carbon: toward an improved understanding of the role of vegetated coastal habitats in sequestering CO
2". http://espace.library.uq.edu.au/view/UQ:251863/UQ251863_OA.pdf.CO2&rft.atitle=&rft.aulast=McLeod&rft.aufirst=E.&rft.au=McLeod, E.&rft_id=http://espace.library.uq.edu.au/view/UQ:251863/UQ251863_OA.pdf&rfr_id=info:sid/en.wikibooks.org:Earth:Blue_carbon">
46. ↑ Waycott, M (2009). "Accelerating loss of seagrasses across the globe threatens coastal ecosystems". Proceedings of the National Academy of Sciences of the USA 106 (30): 12377–12381. doi:10.1073/pnas.0905620106. PMID 19587236. Bibcode: 2009PNAS..10612377W.
47. ↑ Orth, Robert J.; Carruthers, Tim J. B.; Dennison, William C.; Duarte, Carlos M.; Fourqurean, James W.; Heck, Kenneth L.; Hughes, A. Randall; Kendrick, Gary A. et al. (2006-12-01). "A Global Crisis for Seagrass Ecosystems" (in en). BioScience 56 (12): 987–996. doi:10.1641/0006-3568(2006)56[987:AGCFSE2.0.CO;2]. ISSN 0006-3568.
48. ↑ Greiner, J. T.; McGlathery, K. J.; Gunnell, J.; McKee, B. A. (2013). "Seagrass restoration enhances "blue carbon" sequestration in coastal waters". PLOS ONE 8 (8): e72469. doi:10.1371/journal.pone.0072469. PMID 23967303. Bibcode: 2013PLoSO...872469G.
49. ↑ Bax, Narissa; Barnes, David K. A.; Pineda-Metz, Santiago E. A.; Pearman, Tabitha; Diesing, Markus; Carter, Stefanie; Downey, Rachel V.; Evans, Chris D. et al. (2022-06-10). "Towards Incorporation of Blue Carbon in Falkland Islands Marine Spatial Planning: A Multi-Tiered Approach". Frontiers in Marine Science 9: 872727. doi:10.3389/fmars.2022.872727. ISSN 2296-7745.
50. ↑ "Ocean acidification" (in en). https://www.noaa.gov/education/resource-collections/ocean-coasts/ocean-acidification.
51. ↑ House, Kurt Zenz; Schrag, Daniel P.; Harvey, Charles F.; Lackner, Klaus S. (2006). "Permanent carbon dioxide storage in deep-sea sediments". Proceedings of the National Academy of Sciences 103 (33): 12291–12295. doi:10.1073/pnas.0605318103. PMID 16894174. Bibcode: 2006PNAS..10312291H.
52. ↑ Leung, Dennis Y.C.; Caramanna, Giorgio; Maroto-Valer, M. Mercedes (2014). "An overview of current status of carbon dioxide capture and storage technologies". Renewable and Sustainable Energy Reviews 39: 426–443. doi:10.1016/j.rser.2014.07.093.
53. ↑ "Deep blue carbon storage" (in en). https://www.eurekalert.org/news-releases/509471.
54. ↑ "The Importance of Deep Blue Carbon". https://www.ofi.ca/event/cop27-the-importance-of-deep-blue-carbon.
55. ↑ 55.0 55.1 "Ocean-Based Carbon Dioxide Removal: Deep Sea Storage" (in en-US). https://oceanvisions.org/deep-sea-storage/.
56. ↑ "A Research Strategy for Ocean Carbon Dioxide Removal and Sequestration". https://www.nationalacademies.org/our-work/a-research-strategy-for-ocean-carbon-dioxide-removal-and-sequestration.
57. ↑ "Carbon dioxide could be stored below ocean floor, research shows" (in en). https://www.sciencedaily.com/releases/2022/03/220307113139.htm.
58. ↑ BAS-WOHLERT, Camille. "Undersea graveyard for imported CO2 opens in Denmark" (in en). https://phys.org/news/2023-03-undersea-graveyard-imported-co2-denmark.html.
59. ↑ "RUNNING TIDE BECOMES MICROSOFT'S FIRST OPEN OCEAN-BASED CARBON REMOVAL SUPPLIER". 10 March 2023. https://finance.yahoo.com/news/running-tide-becomes-microsofts-first-130000738.html.
60. ↑ "Concept Brief: Ocean Carbon Observatory". https://global-uploads.webflow.com/61082dc068d2d4fd1cc4461e/61b39939ac261f2a2f807671_Concept Brief - Ocean Carbon Observatory.pdf.
61. ↑ "North Atlantic Carbon Observatory (NACO)". https://www.ofi.ca/impact/policy/ocean-carbon/carbon-observatory.
62. ↑ "Denmark, the first country to import CO2 and bury it undersea". 8 March 2023. https://www.euronews.com/2023/03/08/denmark-the-first-country-to-import-co2-and-bury-it-undersea?utm_source=flipboard.com&utm_campaign=feeds_europe&utm_medium=referral.
63. ↑ Sutton, Malcolm (13 August 2021). "Blue carbon to create 'insurable' value from muddy wetlands in South Australia". Australian Broadcasting Corporation. https://www.abc.net.au/news/2021-08-13/blue-carbon-creating-value-from-magnificent-mud/100371238.
64. ↑ Chung, I. K., Oak, J. H., Lee, J. A., Shin, J. A., Kim, J. G., & Park, K. S. (2013). Installing kelp forests/seaweed beds for mitigation and adaptation against global warming: Korean Project Overview. ICES Journal of Marine Science: Journal du Conseil, fss206.
65. ↑ Bryce, Emma (6 July 2020). "Can the Forests of the World's Oceans Contribute to Alleviating the Climate Crisis?". https://www.resilience.org/stories/2020-07-06/can-the-forests-of-the-worlds-oceans-contribute-to-alleviating-the-climate-crisis/.

## External links

* The Ocean Frontier Institute
* The Blue Carbon Initiative

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