炭素除去リスクを管理し効果的なポートフォリオ構築を導く「Carbon at Risk」指標
The Carbon at Risk measure to manage carbon removal risk and guide effective portfolio construction (原題)
Lee Bali, Tom Bearpark, Oleksandr Kit, Delia Meth-Cohn, Frederic Olbert, Frank Venmans, Gabrielle Walker, Paul Young, Ben Groom
🤖 gxceed AI 要約
日本語
ネットゼロ達成にはCDRを2050年までに7〜9GtCO2/年へ拡大する必要があるが、市場には永続性リスクの標準的定量指標がない。金融のVaRに着想を得たCarbon at Risk（CaR）は、契約除去量と実現貯留量の乖離を確率論的に測る指標で、森林炭素では95%CaRが200年で70%超、DACCSでは規制状況により0.15〜17%と試算された。現行の一律バッファ控除は低リスク案件を過剰保護し高リスク案件を過小保護する構造的欠陥があり、CaRはリスク校正型の保護メカニズムや技術横断比較、国際会計枠組みの基盤を提供する。
English
Carbon removal must scale from ~2 to 7–9 GtCO2/yr by 2050, yet markets lack a standardised permanence-risk measure. Inspired by Value at Risk, the authors propose Carbon at Risk (CaR), a probabilistic shortfall measure between contracted and realised storage. Proof-of-concept calibrations show 95% CaR above 70% over 200 years for a California forest project, and 0.15–17% for DACCS depending on regulation. Flat-rate buffer deductions systematically mis-price risk; CaR enables risk-calibrated buffers, insurance pricing, portfolio construction, and international carbon accounting.
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
CDRクレジットの永続性・逆転リスク評価は、SSBJや有報でのカーボンクレジット活用開示、投資家のネットゼロ調達判断に直結する。日本企業が海外CDRクレジットを調達する際のリスク評価基準としても示唆に富む。
In the global GX context
As ISSB/CSRD and voluntary carbon market integrity initiatives (ICVCM, VCMI) push for credible permanence accounting, CaR offers a quantitative, technology-agnostic framework that could inform buffer pool design, transition finance risk pricing, and disclosure of removal claims under net-zero standards.
👥 読者別の含意
🔬研究者:CDRの永続性リスクを確率論的に扱う新たな定量枠組みとして、炭素会計・気候ファイナンス研究の方法論的参照点になる。
🏢実務担当者:カーボンクレジット調達やネットゼロ目標における除去量のリスク評価・バッファ設計に活用できる。
🏛政策担当者:CDRの永続性規制や国際炭素会計枠組みの設計において、リスク校正型の保護メカニズム導入の根拠を提供する。
📄 Abstract（原文）
Meeting net-zero targets requires scaling carbon dioxide removal from ∼2 GtCO2/yr today to 7–9 GtCO2/yr by 2050. Since different carbon removal technologies face binding upper limits on deployable scale, this will require trillions of dollars of investment to be allocated across technologies with fundamentally different risk and cost profiles. Yet carbon removal markets lack a standardised, quantitative measure of permanence risk. Inspired by Value at Risk in financial markets, we propose Carbon at Risk (CaR): a probabilistic measure of the shortfall between contracted removals and realised storage at a given confidence level and time horizon. We calibrate CaR in two proof-of-concept applications: forest carbon, where Monte Carlo simulations driven by satellite fire data yield a single-project 95% CaR of more than 70% over 200 years for California, and geological storage (DACCS), where 95% CaR ranges from 0.15% (well-regulated offshore) to 17% (poorly regulated onshore). This variation implies that current permanence mechanisms, typically flat-rate deductions applied once at credit issuance, systematically over-buffer low-risk projects while under-buffering high-risk ones, and could be structurally ill-suited to risks that compound and shift over decades. We show that combining technologies in a portfolio creates a trade-off between cost and risk, and that the minimum cost of meeting a permanence target depends on the correlation structure of key risk factors. CaR provides a basis for risk-calibrated protection mechanisms, from buffer design and insurance pricing to fund-based instruments sized to cover reversal risk, across policy-relevant time horizon. It also provides the basis for technology-agnostic project comparison, reserve construction, and for the international accounting frameworks needed to steward global carbon stocks and sinks as a common resource.
🔗 Provenance — このレコードを発見したソース
- openalex https://researchonline.lse.ac.uk/id/eprint/141470/1/Carbon_at_Risk_Nature_4_Elisa_Piccaro.pdffirst seen 2026-10-26 04:50:00 · last seen 2026-11-06 04:56:25
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