低炭素バイオ燃料政策の拡大で農業の脱炭素化を提案(Decarbonize agriculture by expanding policies aimed at low-carbon biofuels)

2025-08-15 イリノイ大学アーバナ・シャンペーン校

イリノイ大学の研究者らは、低炭素バイオ燃料向け政策を拡張し農業全体の脱炭素化を促すべきだと提言した。従来は栽培方法に関係なく作物が均一に扱われていたが、カバークロップ、不耕起、バイオ炭投入、施肥最適化など「気候スマート農業」実践を反映させれば、原料作物の炭素強度に応じて農家に追加報酬を与えられる。これによりバイオ燃料市場とカーボン市場を統合し、持続可能な農業へのインセンティブを強化できる。世界的導入で年間40〜80億トンCO₂削減が見込まれ、世界排出量の最大2割に相当する規模となる。

低炭素バイオ燃料政策の拡大で農業の脱炭素化を提案(Decarbonize agriculture by expanding policies aimed at low-carbon biofuels)Researchers have installed a device to measure how different farming practices affect carbon flux on the farm. Photo by Fred Zwicky

<関連情報>

農業の脱炭素化への道筋として気候適応型バイオ燃料政策 農場ごとの炭素強度スコアに依存する政策は、気候変動対応型農業実践を促進する可能性があります。 Climate-smart biofuel policy as a pathway to decarbonize agriculture A policy that relies on farm-specific carbon-intensity scores can promote climate-smart agricultural practices.

Madhu Khanna, Bruno Basso, Jeff O’Hara, David Zilberman, and Gal Hochman
Science  Published:14 Aug 2025
DOI:https://doi.org/10.1126/science.adw6739

Abstract

Strategies for achieving net-zero emissions climate goals have emphasized an important role for bioenergy to displace fossil fuels and for carbon-dioxide (CO2) removal from the atmosphere. Soil carbon sequestration is one of the key approaches for using the vast potential of land as a sink for atmospheric carbon. Carbon mitigation could be as high as 4 billion to 8 billion tonnes of CO2 per year with near complete deployment globally of practices that enhance soil carbon sequestration with crop production (1). However, there is a disconnect between renewable energy policies to promote the production of low-carbon biofuels and conservation policies that promote soil carbon sequestration practices. We propose that any “climate-smart” biofuel policy should consider farm-specific values of emissions from biofuel feedstock production and soil carbon sequestration and incentivize the adoption of climate-smart practices. This could provide lessons and develop capacity that may help expand policies and practices to agriculture more broadly.

1204農業及び蚕糸
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