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Practice- or results-based subsidies: balancing the direct costs for soil carbon sequestration and transaction costs for farmers and monitoring agencies

実績ベースまたは結果ベースの補助金：土壌炭素隔離の直接コストと農家・監視機関の取引コストのバランス (AI 翻訳)

Luiza Martins Karpavicius, Katarina Elofsson

Q Open📚 査読済 / ジャーナル2026-05-01#炭素価格Origin: EU
DOI: 10.1093/qopen/qoag015
原典: https://doi.org/10.1093/qopen/qoag015

🤖 gxceed AI 要約

日本語

本研究は、農業土壌炭素隔離に対する実績ベースと結果ベースの補助金を比較。結果ベースの補助金が高い純利益と隔離量をもたらすことを示し、炭素価格250€/tCO2eの場合、実績ベースが優位になるには監視コストが結果ベースの30%以下である必要がある。

English

This study compares practice-based and results-based subsidies for agricultural soil carbon sequestration, finding that results-based subsidies yield higher net benefits and sequestration. For a practice-based scheme to outperform, its monitoring costs must be less than 30% of those for a results-based scheme at a carbon price of €250/tCO2e.

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

日本の農林水産省も農業炭素隔離に注目しており、補助金制度設計に示唆を与える。特にモニタリングコストと炭素価格の関係は、日本のカーボンプライシング導入時に重要な知見となる。

In the global GX context

This paper offers valuable insights for global carbon sequestration policy design, particularly as countries like the EU and US explore agricultural carbon markets. It highlights the trade-off between direct costs and transaction costs, relevant for carbon accounting and subsidy optimization.

👥 読者別の含意

🔬研究者:This paper provides a rigorous comparison of subsidy mechanisms with heterogeneous farmers, useful for climate policy modelers.

🏢実務担当者:Farmers and agri-businesses can understand the cost implications of different subsidy types for carbon sequestration.

🏛政策担当者:Policymakers designing agricultural carbon subsidies should note the monitoring cost thresholds compared to carbon prices.

📄 Abstract（原文）

Abstract Policymakers increasingly seek to promote agricultural carbon sequestration, avoiding both income losses for farmers and excessive public implementation costs. This study compares practice- and results-based subsidies to soil carbon sequestration with respect to their total costs, sequestration achieved, and income effects. We develop a numerical model that maximizes social net benefits while accounting for private transaction costs, public monitoring costs, and regional and farm type heterogeneity. The findings reveal that results-based subsidies deliver higher net benefits and sequestration. The per hectare monitoring costs for a practice-based scheme must be less than 30 per cent of those for a results-based scheme for the former to deliver higher net benefits, given a carbon price of 250 €/tCO₂e. Sensitivity analysis shows that higher carbon prices require the monitoring costs of a practice-based scheme to be even lower relative to those of a results-based scheme in order to outperform it.

🔗 Provenance — このレコードを発見したソース

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