Are carbon tariffs climate policy?
炭素関税は気候政策か？ (AI 翻訳)
Gregory Casey, Kyle Meng, Ivan Rudik
🤖 gxceed AI 要約
日本語
本研究は、米国の炭素関税を国内炭素税の有無で比較し、単独の関税は世界の排出削減量が複合政策の半分にとどまること、GDP・厚生への効果も複合政策の方が大きいことを示した。多国間関税協定の効果は限定的だが、複合政策では参加国増加に伴い削減効果が拡大する。
English
This paper uses a quantitative trade model to compare U.S. carbon tariffs with and without a domestic carbon tax. It finds that standalone tariffs achieve only half the global emission reductions of the combined policy, increase U.S. emissions, and have smaller GDP/welfare gains. Multilateral tariff-only agreements have modest and non-monotonic effects, while combined policies scale with membership.
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
日本はEUのCBAMや米国の炭素関税導入の動きを受け、輸出企業への影響と国内炭素価格の整合性が課題。本論文は、国内炭素税なしの関税単独では効果が限定的なことを示し、日本が国際的な炭素価格政策を検討する際の示唆を与える。
In the global GX context
As carbon border adjustment mechanisms (e.g., EU CBAM) gain traction globally, this paper provides a rigorous comparison of tariff-only versus combined tariff-and-tax approaches. It highlights the limitations of unilateral tariffs and the importance of domestic carbon pricing for effective global climate policy, informing debates on trade and climate.
👥 読者別の含意
🔬研究者:Provides a quantitative framework to analyze interactions between carbon tariffs and domestic carbon taxes, with implications for trade and climate policy design.
🏢実務担当者:Helps corporate sustainability teams assess potential cost impacts of carbon border adjustments on carbon-intensive exports and understand policy risks.
🏛政策担当者:Offers evidence that carbon tariffs alone are less effective than combining them with domestic carbon pricing, crucial for designing efficient border adjustment mechanisms.
📄 Abstract（原文）
Carbon import tariffs, traditionally considered a complement to domestic climate policy, are increasingly proposed as standalone policies.We build a quantitative trade model to compare U.S. carbon tariffs with and without a domestic carbon tax, each applied to a set of carbon-intensive, trade-exposed sectors.We find three main results.First, a U.S. carbon tariff increases U.S. emissions, lowers foreign emissions, and on net achieves half the global emissions reductions of the combined policy, which lowers both U.S. and foreign emissions.Second, both approaches increase U.S. GDP and welfare, but the combined policy has a larger effect due to terms of trade improvements.Third, global emissions reductions from multilateral tariff-only agreements are modest and do not increase monotonically with greater membership, whereas under combined policies they scale considerably with membership.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.3386/w35307first seen 2026-06-17 07:27:37
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