Are carbon tariffs climate policy?
炭素関税は気候政策か？ (AI 翻訳)
Gregory Casey, Kyle C. Meng, Ivan Rudik
🤖 gxceed AI 要約
日本語
本論文は、米国の炭素関税を国内炭素税の有無で比較する定量貿易モデルを構築。単独関税は世界の排出削減量が併用政策の半分にとどまる一方、米国のGDPと厚生を向上させることを示す。多国間関税のみの協定では削減効果は限定的であり、併用政策では加盟国増加に伴い効果が拡大する。
English
This paper builds a quantitative trade model to compare US carbon tariffs with and without a domestic carbon tax. It finds that a standalone carbon tariff achieves half the global emissions reductions of the combined policy, while increasing US GDP and welfare. Multilateral tariff-only agreements yield modest reductions, whereas 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
日本のカーボンプライシング検討において、国境炭素調整の効果を評価するための重要なエビデンスを提供する。特に単独関税と国内炭素税との併用の比較は、日本の政策設計に示唆を与える。
In the global GX context
This paper informs the global debate on carbon border adjustment mechanisms (CBAM), demonstrating that combining domestic carbon pricing with border tariffs is more effective for emissions reductions and economic welfare.
👥 読者別の含意
🔬研究者:Provides empirical evidence on the macroeconomic effects of carbon tariffs as climate policy instruments.
🏢実務担当者:For companies in trade-exposed sectors, this analysis clarifies potential cost impacts of carbon border adjustments.
🏛政策担当者:Informs the design of carbon border adjustment policies, highlighting the importance of combining with domestic carbon pricing.
📄 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
- crossref https://doi.org/10.31235/osf.io/3aw8s_v1first seen 2026-06-16 05:34:24
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