Carbon Calculus™: New metrics for sustainable decision making
Carbon Calculus™：持続可能な意思決定のための新指標 (AI 翻訳)
Brooks S, Kitchens C, Leighton W
🤖 gxceed AI 要約
日本語
本論文は、CO2排出の時間価値を組み込んだ新しい脱炭素意思決定ツール「Carbon Calculus™」を提案する。CO2の正味現在価値（NPV_CO2）などの指標を定義し、異なる規模・時間枠の脱炭素戦略を定量的に比較可能にする。早期行動の重要性を定量化し、10年遅延すると必要な削減量が14.2%増加することを示す。
English
This paper proposes Carbon Calculus™, a novel decarbonization decision-making tool that integrates the time value of CO2 into a sink dissipation model. It defines metrics like Net Present Value of CO2 (NPV_CO2) to compare strategies across magnitudes and timeframes, quantifying the opportunity cost of delay and the importance of early action. For instance, delaying action by 10 years requires a 14.2% increase in reductions to compensate.
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
日本の企業はSSBJ開示やカーボンニュートラル目標の達成に向け、限られた予算で効果的な削減投資を選択する必要がある。本指標は、CO2削減の時間価値を考慮した投資判断を可能にし、統合報告書や投資家向け開示での説明力を高める。
In the global GX context
Globally, as companies align with TCFD/ISSB and set Net Zero targets, this tool provides a quantitative basis for prioritizing decarbonization investments, addressing the temporal dimension often missing in carbon accounting. It supports transition finance by valuing early action and permanent storage, relevant for CSRD and SEC climate disclosure.
👥 読者別の含意
🔬研究者:Provides a novel metric (NPV_CO2) for valuing decarbonization pathways, useful for carbon accounting and climate finance research.
🏢実務担当者:Offers a decision-making tool to prioritize decarbonization projects and communicate the value of early action to stakeholders.
🏛政策担当者:Highlights the importance of early action and permanent storage, informing carbon pricing and Net Zero policy design.
📄 Abstract（原文）
<title>Abstract</title> <p> Driven by the greenhouse effect, emitted GHGs cause an energy imbalance represented by radiative forcing and realized through increasing global average temperature. Between calendar years 1990 and 2023, 81% of the increase in atmospheric radiative forcing was caused by carbon dioxide (CO <sub>2</sub> ) emissions alone. Presented with multiple possible decarbonization projects and constrained by available budgets, organizations face a difficult decision-making process to decide which actions to take, when, and in what order to optimize their CO <sub>2</sub> reduction pathway. Existing microeconomic metrics like time-value of money, net present value, and breakeven are useful to compare the monetary value of alternative scenarios. However, since these decisions are largely motivated by decarbonization, what comparable carbon-specific metrics can be used? Without quantitative clarity beyond economics, organizations lack confidence in decarbonization decisions, leading to delayed, under-informed, and suboptimal capital allocation. Derived from carbon-climate impulse response models, Carbon Calculus™ is a novel decarbonization decision-making tool that integrates the time value of CO <sub>2</sub> into a simple CO <sub>2</sub> sink dissipation model. New metrics are defined, including Net Present Value of CO <sub>2</sub> (NPV <sub>CO2</sub> ), which quantitatively values and compares decarbonization strategies across different magnitudes and time frames. Results quantify the opportunity cost of decarbonization and quantitatively support the importance of early decarbonization action. If storage is not permanent, more CO <sub>2</sub> must be captured to offset its temporality. One ton of CO <sub>2</sub> removed & permanently stored today has an equivalent cumulative impact reduction to 75.7 tons CO <sub>2</sub> removed & temporarily stored for 1 year. Furthermore, decarbonization actions become less valuable the longer we wait to act. Delaying a decarbonization action by 10 years will require a 14.2% increase in reductions 10 years from now to neutralize the lost opportunity cost imposed by delaying. The intention behind Net Zero targets is to reduce the total quantity of emissions for reductions in atmospheric temperature. With Carbon Calculus, sustainability goals can be updated to not just reach Net Zero by a specific date, but also minimize the cumulative CO <sub>2</sub> emitted along the way. </p>
🔗 Provenance — このレコードを発見したソース
- Research Square https://doi.org/10.21203/rs.3.rs-10319252/v1first seen 2026-08-12 04:31:09 · last seen 2026-08-13 04:42:59
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