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  Within-country inequality and the shaping of a just global climate policy

Young-Brun, M., Dennig, F., Errickson, F., Feindt, S., Méjean, A., Zuber, S. (2025): Within-country inequality and the shaping of a just global climate policy. - Proceedings of the National Academy of Sciences of the United States of America (PNAS), 122, 39, e2505239122.
https://doi.org/10.1073/pnas.2505239122

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https://creativecommons.org/licenses/by-nc-nd/4.0/

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https://doi.org/10.5281/zenodo.16894908 (???ENUM_CONTENTCATEGORY_research-data???)
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 ???ViewItemFull_lblCreators???:
Young-Brun, Marie1, ???ENUM_CREATORROLE_AUTHOR???
Dennig, Francis1, ???ENUM_CREATORROLE_AUTHOR???
Errickson, Frank1, ???ENUM_CREATORROLE_AUTHOR???
Feindt, Simon2, ???ENUM_CREATORROLE_AUTHOR???                 
Méjean, Aurélie1, ???ENUM_CREATORROLE_AUTHOR???
Zuber, Stéphane1, ???ENUM_CREATORROLE_AUTHOR???
???ViewItemFull_lblAffiliations???:
1External Organizations, ou_persistent22              
2Potsdam Institute for Climate Impact Research, Potsdam, ou_persistent13              

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 ???ViewItemFull_lblAbstract???: Climate policy design must balance emissions mitigation with concerns for fairness, particularly as climate change disproportionately affects the poorest households within and across countries. Integrated Assessment Models used for global climate policy evaluation have so far typically not considered inequality effects within countries. To fill this gap, we develop a global Integrated Assessment Model representing national economies and subnational income, mitigation cost, and climate damage distribution and assess a range of climate policy schemes with varying levels of effort sharing across countries and households. The schemes are consistent with limiting temperature increases to 2 °C and account for the possibility to use carbon tax revenues to address distributional effects within and between countries. We find that carbon taxation with redistribution improves global welfare and reduces inequality, with the most substantial gains achieved under uniform taxation paired with global per capita transfers. A Loss and Damage mechanism offers significant welfare improvements in vulnerable countries while requiring only a modest share of global carbon revenues in the medium term. The poorest households within all countries may benefit from the transfer scheme, in particular when some redistribution is made at the country level. Our findings underscore the potential for climate policy to advance both environmental and social goals, provided revenue recycling mechanisms are effectively implemented. In particular, they demonstrate the feasibility of a welfare improving global climate policy involving limited international redistribution.

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???ViewItemFull_lblLanguages???: eng - English
 ???ViewItemFull_lblDates???: 2025-07-042025-03-072025-08-112025-09-232025-09-30
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 ???ViewItemFull_lblIdentifiers???: ???ENUM_IDENTIFIERTYPE_DOI???: 10.1073/pnas.2505239122
???ENUM_IDENTIFIERTYPE_ORGANISATIONALK???: RD3 - Transformation Pathways
???ENUM_IDENTIFIERTYPE_PIKDOMAIN???: RD3 - Transformation Pathways
???ENUM_IDENTIFIERTYPE_RESEARCHTK???: Inequality and Equity
???ENUM_IDENTIFIERTYPE_RESEARCHTK???: Climate Policy
???ENUM_IDENTIFIERTYPE_RESEARCHTK???: Carbon Pricing
???ENUM_IDENTIFIERTYPE_REGIONALK???: Global
???ENUM_IDENTIFIERTYPE_MDB_ID???: No MDB - stored outside PIK (see locators/paper)
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???ViewItemFull_lblSourceTitle???: Proceedings of the National Academy of Sciences of the United States of America (PNAS)
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???ENUM_IDENTIFIERTYPE_PUBLISHER???: National Academy of Sciences (NAS)