What does this research mean for the field?

A carbon tax must be set between $31 and $84 per tonne of CO₂ to effectively reduce emissions without disproportionately worsening income inequality. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To evaluate the nonlinear threshold effects of carbon taxation on climate change mitigation and income inequality.

September 5, 2026Humanities and Social Sciences CommunicationsOpen Access

How much is too much? Carbon tax thresholds for climate mitigation and social equity

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Authors

ZNZeineb Al Hadi Nagara MZMontassar ZayatiUniversity of Sousse RNRidha NouiraHigher Institute of Management

Discussion

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Overview

Panel threshold analysis reveals dual carbon tax turning points across 70 countries, indicating a narrow window balancing emissions and inequality.

Key Points

To evaluate the nonlinear threshold effects of carbon taxation on climate change mitigation and income inequality.
Applied a dynamic panel threshold model analyzing observational macroeconomic data across 70 countries from 2000 to 2022.
Evaluated primary outcomes of carbon dioxide emissions and income distribution alongside robustness checks using climate indicators (precipitation, humidity, temperature) and alternative carbon tax proxies.
A carbon tax below $31 per tonne of CO₂ yields insufficient incentives to significantly reduce greenhouse gas emissions.
Taxes exceeding $31 per tonne effectively lower emissions, but crossing an upper threshold of $84 per ton of CO₂ significantly worsens income inequality by placing an unequal burden on lower-income households.

Cite This Study

Nagara et al. (2026) studied this question.

synapsesocial.com/papers/6a9bd4536b95aff0620ebe51 https://doi.org/10.1057/s41599-026-08790-9

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September 5, 2026Humanities and Social Sciences CommunicationsOpen Access

How much is too much? Carbon tax thresholds for climate mitigation and social equity

View Full Paper

Ask AI

Bookmark

Authors

ZNZeineb Al Hadi Nagara MZMontassar ZayatiUniversity of Sousse RNRidha NouiraHigher Institute of Management

Discussion

Member takes

Overview

Panel threshold analysis reveals dual carbon tax turning points across 70 countries, indicating a narrow window balancing emissions and inequality.

Key Points

To evaluate the nonlinear threshold effects of carbon taxation on climate change mitigation and income inequality.
Applied a dynamic panel threshold model analyzing observational macroeconomic data across 70 countries from 2000 to 2022.
Evaluated primary outcomes of carbon dioxide emissions and income distribution alongside robustness checks using climate indicators (precipitation, humidity, temperature) and alternative carbon tax proxies.
A carbon tax below $31 per tonne of CO₂ yields insufficient incentives to significantly reduce greenhouse gas emissions.
Taxes exceeding $31 per tonne effectively lower emissions, but crossing an upper threshold of $84 per ton of CO₂ significantly worsens income inequality by placing an unequal burden on lower-income households.

Cite This Study

Nagara et al. (2026) studied this question.

synapsesocial.com/papers/6a9bd4536b95aff0620ebe51 https://doi.org/10.1057/s41599-026-08790-9

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