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耐久性のある炭素除去に向けたバイオ炭クレジット認証プロトコルの評価

Evaluating Biochar Crediting Protocols for Durable Carbon Removal (原題)

Mukhopadhyay, Shreya, Gao, Xiaodong, Seay, Julia, Chaza, Thembelihle, Sohi, Saran, Masiello, Caroline, Medlock III. Kenneth B.

EarthArXivプレプリント2026-09-17#炭素会計Origin: Global経営インパクト: 資金調達対象セクター: agriculture
DOI: 10.31223/x5x51w
原典: https://eartharxiv.org/repository/object/15036/download/26109/

🤖 gxceed AI 要約

日本語

本論文は8つの自主的バイオ炭クレジット認証プロトコルを、原料適格性・製造条件・施用基準・永続性・反転リスク・MRVの6項目で比較評価した。全プロトコルに共通する要件がある一方、永続性の運用方法や炭素クレジットの完全性には大きな差異があることを明らかにした。H:Corg比などの組成指標を用いる手法と、最終用途に応じた時間的アプローチを採用する手法が混在している。火災によるバイオ炭損失、景観移動・侵食、土壌炭素プライミングという3つの科学的・方法論的不確実性を特定し、より調和のとれた証拠に基づくアプローチの必要性を結論づけている。

English

This paper comparatively reviews eight voluntary biochar crediting protocols across six parameters: feedstock eligibility, production conditions, application criteria, permanence, reversal risk, and MRV. While all protocols share common requirements on feedstock restrictions, conversion controls, and end-use documentation, they differ significantly in how they operationalize permanence and carbon crediting integrity—some using compositional indicators like H:Corg ratios, others temporal or end-use approaches. The authors identify three key uncertainties (fire loss, landscape mobility/erosion, and priming of native soil carbon) and call for more harmonized, evidence-based approaches to durability and full life-cycle emissions to support high-integrity biochar CDR markets.

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

📝 gxceed 編集解説 — Why this matters

日本のGX文脈において

日本ではJ-クレジット制度においてバイオ炭施用が認証されており、本論文のプロトコル比較は国内認証制度の永続性・MRV要件の改善に直接示唆を与える。また、SSBJ基準におけるScope 3・炭素除去の開示を検討する企業にとって、バイオ炭クレジットの品質評価の枠組みとして有用である。

In the global GX context

This paper directly informs the global conversation on carbon dioxide removal (CDR) integrity under Article 6, VCMI, and emerging compliance markets. It provides a comparative framework that can help standard-setters (e.g., ICVCM, Verra, Gold Standard) harmonize permanence and MRV requirements for biochar, a key durable CDR pathway. For ISSB/CSRD reporters, it clarifies the methodological diversity that companies must navigate when claiming biochar credits.

👥 読者別の含意

🔬研究者:Provides a systematic comparison of biochar crediting protocols and identifies key scientific uncertainties for future research on durability and life-cycle assessment.

🏢実務担当者:Helps corporate sustainability teams evaluate the quality and comparability of biochar carbon credits when making procurement or offsetting decisions.

🏛政策担当者:Highlights the need for harmonized standards on permanence, reversal risk, and MRV to ensure integrity in biochar carbon removal markets.

📄 Abstract（原文）

As biochar expands as a source of carbon credits it has become increasingly clear that there are major differences among biochar protocols. This variation can make it challenging for producers to choose protocols and can make it difficult for buyers to understand the comparative value of different certified biochar credits, and in both these cases investor confidence is jeopardized. Here we comparatively review eight voluntary biochar crediting protocols, evaluating their approaches to six parameters: feedstock eligibility, production conditions, application criteria, permanence, reversal risk, and monitoring, reporting, and verification (MRV). We find that all protocols have three common types of requirements: restrictions on eligible biomass feedstocks, controls in thermochemical conversion, and documentation of end uses associated with carbon storage. However, we also find protocols have major differences in how they operationalize permanence and carbon crediting integrity. Some methodologies treat permanence as a material quality and use compositional indicators such as H:Corg ratios to define permanence. Others adopt a temporal or end use approach, quantifying the fraction of carbon expected to remain stored over a specific time period given the final use. Also, requirements for lifecycle assessment, chain of custody documentation, and non-soil application vary considerably. Finally, we identify three key scientific and methodological uncertainties that may present future challenges for all biochar protocols: biochar loss during fire, landscape mobility and erosion, and biochar induced priming of native soil-carbon. We conclude that more harmonized, evidence-based approaches to durability, full life-cycle emissions and uncertainty management are needed to improve credibility and support high integrity biochar CDR markets.

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