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  Mitigation and adaptation emissions embedded in the broader climate transition

Lesk, C., Csala, D., Hasse, R., Sgouridis, S., Levesque, A., Mach, K. J., Horen Greenford, D., Matthews, H. D., Horton, R. M. (2022): Mitigation and adaptation emissions embedded in the broader climate transition. - Proceedings of the National Academy of Sciences of the United States of America (PNAS), 119, 47, e2123486119.
https://doi.org/10.1073/pnas.2123486119

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 Creators:
Lesk, Corey1, Author
Csala, Denes1, Author
Hasse, Robin2, Author              
Sgouridis, Sgouris1, Author
Levesque, Antoine2, Author              
Mach, Katharine J.1, Author
Horen Greenford, Daniel1, Author
Matthews, H. Damon1, Author
Horton, Radley M.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Potsdam Institute for Climate Impact Research, ou_persistent13              

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 Abstract: Climate change necessitates a global effort to reduce greenhouse gas emissions while adapting to increased climate risks. This broader climate transition will involve large-scale global interventions including renewable energy deployment, coastal protection and retreat, and enhanced space cooling, all of which will result in CO2 emissions from energy and materials use. Yet, the magnitude of the emissions embedded in these interventions remains unconstrained, opening the potential for underaccounting of emissions and conflicts or synergies between mitigation and adaptation goals. Here, we use a suite of models to estimate the CO2 emissions embedded in the broader climate transition. For a gradual decarbonization pathway limiting warming to 2 °C, selected adaptation-related interventions will emit ∼1.3 GtCO2 through 2100, while emissions from energy used to deploy renewable capacity are much larger at ∼95 GtCO2. Together, these emissions are equivalent to over 2 y of current global emissions and 8.3% of the remaining carbon budget for 2 °C. Total embedded transition emissions are reduced by ∼80% to 21.2 GtCO2 under a rapid pathway limiting warming to 1.5 °C. However, they roughly double to 185 GtCO2 under a delayed pathway consistent with current policies (2.7 °C warming by 2100), mainly because a slower transition relies more on fossil fuel energy. Our results provide a holistic assessment of carbon emissions from the transition itself and suggest that these emissions can be minimized through more ambitious energy decarbonization. We argue that the emissions from mitigation, but likely much less so from adaptation, are of sufficient magnitude to merit greater consideration in climate science and policy.

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Language(s): eng - English
 Dates: 2022-11-212022-11-21
 Publication Status: Finally published
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1073/pnas.2123486119
PIKDOMAIN: RD3 - Transformation Pathways
Organisational keyword: RD3 - Transformation Pathways
Working Group: Energy Systems
Working Group: Climate & Energy Policy
MDB-ID: yes - 3380
Research topic keyword: Adaptation
Research topic keyword: Climate impacts
Research topic keyword: Decarbonization  
Research topic keyword: Mitigation
Regional keyword: Global
Model / method: PIAM
OATYPE: Hybrid Open Access
 Degree: -

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Title: Proceedings of the National Academy of Sciences of the United States of America (PNAS)
Source Genre: Journal, SCI, Scopus, p3
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Pages: - Volume / Issue: 119 (47) Sequence Number: e2123486119 Start / End Page: - Identifier: CoNE: https://publications.pik-potsdam.de/cone/journals/resource/journals410
Publisher: National Academy of Sciences (NAS)