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低炭素北極海運への道筋：気候変動下における炭素税の閾値と市場均衡

Pathway to low-carbon arctic shipping: carbon tax thresholds and market equilibrium under climate change (原題)

Yutong Guo, Yangjun Wang, Ren Zhang

Frontiers in Marine Science📚 査読済 / ジャーナル2026-10-28#炭素価格Origin: CN経営インパクト: 調達リスク対象セクター: transport
DOI: 10.3389/fmars.2026.1944135
原典: https://doi.org/10.3389/fmars.2026.1944135

🤖 gxceed AI 要約

日本語

北極海氷融解による北東航路とスエズ航路の競争を、炭素税を組み込んだ二段階スタックルベルグゲームで分析。炭素税が航路シェアと排出量に与える非単調な影響を明らかにし、温暖化が有効な炭素税閾値を低下させることを示す。深刻な温暖化シナリオでは北極航路が最大22%の貨物を担い、業界排出量は63万トンを超えると推計。

English

A two-level Stackelberg game integrates sea-ice melt scenarios with voyage-level carbon accounting to model competition between the Arctic Northeast Passage and the Suez route under carbon taxes. Results show a non-monotonic emissions effect: too-low taxes spur shipping expansion and rebound emissions. Under severe warming, the Arctic route could capture up to 22% of freight traffic, with industry emissions exceeding 630,000 tonnes.

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

海運の炭素税はIMOのGHG戦略や日本企業のScope 3排出量算定・調達先選択に直結する。北極航路の商業化は日本の海運・物流戦略にも影響し得るが、本稿は中国・欧州間の分析であり、日本への直接示唆は限定的。

In the global GX context

This study informs global carbon pricing design for maritime transport under IMO's GHG strategy, showing how tax thresholds interact with route competition and climate feedbacks. It adds quantitative evidence on the risk of emissions rebound from low carbon taxes, relevant to CBAM-like mechanisms and transition finance for shipping decarbonization.

👥 読者別の含意

🔬研究者:炭素税と航路競争の動学をゲーム理論で捉える枠組みを、海運脱炭素の実証研究に応用できる。

🏢実務担当者:海運・物流企業は炭素税が航路選択とコストに与える非線形影響を踏まえ、調達・輸送計画の感度分析に活用できる。

🏛政策担当者:炭素税設計では税率が低すぎると排出リバウンドを招くため、閾値と温暖化シナリオを考慮した政策調整が重要。

📄 Abstract（原文）

Global maritime trade faces the dual challenges of climate change and the low-carbon transition. The melting of Arctic sea ice is enabling the Northeast Passage to emerge as a potential alternative to the Suez Canal Route, while carbon pricing policies continue to reshape the relative competitive advantages of these two shipping routes. Addressing the limitations of existing research—which overlooks the multi-agent game-theoretic allocation of carbon emissions, lacks dynamic policy–market feedback loops in static comparisons of heterogeneous shipping routes, and fails to adequately assess the cascading effects of carbon taxes under single-scenario analyses—this paper constructs a two-level Stackelberg game model that integrates sea ice melt scenarios with voyage-level carbon emissions accounting. It systematically characterises the ‘carbon tax–voyage speed–cost–route share–emissions’ transmission mechanism and explores the heterogeneous dynamic competition between the two shipping routes, as well as the bidirectional policy–market feedback loops, in a China–Europe scenario. The results indicate that global warming and fuel price volatility significantly influence route competitiveness through dual channels, while a differentiated carbon tax can guide the orderly reallocation of freight traffic towards the low-carbon Arctic route. The emissions reduction effect of the carbon tax exhibits a non-monotonic pattern, with an excessively low tax rate likely to stimulate shipping expansion and trigger a rebound in carbon emissions. Under a severe warming scenario, the Arctic route could account for up to 22 per cent of freight traffic, with industry emissions exceeding 630,000 metric tonnes. Climate warming lowers the threshold for effective carbon tax regulation, while the cost advantage of the Arctic Northeast Passage provides a viable pathway for the long-term implementation of low-carbon policies. This study provides theoretical guidance and quantitative evidence for low-carbon governance in maritime transport, China–Europe shipping route planning, and the commercial development of the Arctic Northeast Passage.

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