Additionality in Blue Carbon Ecosystems : Recommendations for a Universally Applicable Accounting Methodology

© 2024 The Author(s). Global Change Biology published by John Wiley & Sons Ltd.

Détails bibliographiques
Publié dans:Global change biology. - 1999. - 30(2024), 11 vom: 04. Nov., Seite e17559
Auteur principal: Houston, Alex (Auteur)
Autres auteurs: Kennedy, Hilary, Austin, William E N
Format: Article en ligne
Langue:English
Publié: 2024
Accès à la collection:Global change biology
Sujets:Journal Article Review IPCC additionality allochthonous blue carbon carbon crediting nature‐based solutions Carbon 7440-44-0 plus... Carbon Dioxide 142M471B3J Soil
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520 |a Blue carbon ecosystems (BCEs) remove carbon dioxide from the atmosphere and store significant amounts of organic carbon (OC) in their soils. Consequently, the protection and restoration of BCEs may contribute to net greenhouse gas emissions abatement and help address the global challenges of both mitigating and adapting to climate change. An ongoing debate is whether OC sequestered out with the blue carbon (BC) project and transported to its present location (allochthonous) should be counted as 'additional'. There are inconsistencies in the treatment of allochthonous carbon between BCE methodologies, potentially undermining the credibility of global BC accounting initiatives. To explore these inconsistences, we compare the methodologies which we were able to find online, with particular focus on the VERRA, IPCC and BlueCAM methodologies, and review the science underlying any approach to account for allochthonous OC. Our findings indicate that there are currently no robust scientific approaches to define an appropriate apportioning of allochthonous OC for discounting in the calculation of additionality. We therefore advocate for the inclusion of allochthonous OC in BC crediting projects when an observational and experimental approach does not support the calculation (and discounting) of the refractory allochthonous carbon contribution 
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