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  Incremental improvements of 2030 targets insufficient to achieve the Paris Agreement goals

Geiges, A., Nauels, A., Parra, P. Y., Andrijevic, M., Hare, W., Pfleiderer, P., Schaeffer, M., Schleussner, C.-F. (2020): Incremental improvements of 2030 targets insufficient to achieve the Paris Agreement goals. - Earth System Dynamics, 11, 3, 697-708.
https://doi.org/10.5194/esd-11-697-2020

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Geiges, Andreas1, Author
Nauels, Alexander1, Author
Parra, Paola Yanguas1, Author
Andrijevic, Marina1, Author
Hare, William1, Author
Pfleiderer, Peter2, Author              
Schaeffer, Michiel1, Author
Schleussner, Carl-Friedrich2, Author              
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1External Organizations, ou_persistent22              
2Potsdam Institute for Climate Impact Research, ou_persistent13              

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 Abstract: Current global mitigation ambition up to 2030 under the Paris Agreement, reflected in the National Determined Contributions (NDCs), is insufficient to achieve the agreement's 1.5 ∘C long-term temperature limit. As governments are preparing new and updated NDCs for 2020, the question as to how much collective improvement is achieved is a pivotal one for the credibility of the international climate regime. The recent Special Report on Global Warming of 1.5 ∘C by the Intergovernmental Panel on Climate Change has assessed a wide range of scenarios that achieve the 1.5 ∘C limit. Those pathways are characterised by a substantial increase in near-term action and total greenhouse gas (GHG) emission levels about 50 % lower than what is implied by current NDCs. Here we assess the outcomes of different scenarios of NDC updating that fall short of achieving this 1.5 ∘C benchmark. We find that incremental improvements in reduction targets, even if achieved globally, are insufficient to align collective ambition with the goals of the Paris Agreement. We provide estimates for global mean temperature increase by 2100 for different incremental NDC update scenarios and illustrate climate impacts under those median scenarios for extreme temperature, long-term sea-level rise and economic damages for the most vulnerable countries. Under the assumption of maintaining ambition as reflected in current NDCs up to 2100 and beyond, we project a reduction in the gross domestic product (GDP) in tropical countries of around 60 % compared to a no-climate-change scenario and median long-term sea-level rise of close to 2 m in 2300. About half of these impacts can be avoided by limiting warming to 1.5 ∘C or below. Scenarios of more incremental NDC improvements do not lead to comparable reductions in climate impacts. An increase in aggregated NDC ambition of big emitters by 33 % in 2030 does not reduce presented climate impacts by more than about half compared to limiting warming to 1.5 ∘C. Our results underscore that a transformational increase in 2030 ambition is required to achieve the goals of the Paris Agreement and avoid the worst impacts of climate change.

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 Dates: 2020-08-032020
 Publication Status: Finally published
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 Rev. Type: Peer
 Identifiers: DOI: 10.5194/esd-11-697-2020
PIKDOMAIN: RD1 - Earth System Analysis
Organisational keyword: RD1 - Earth System Analysis
MDB-ID: No data to archive
Working Group: Whole Earth System Analysis
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Title: Earth System Dynamics
Source Genre: Journal, SCI, Scopus, p3, oa
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Pages: - Volume / Issue: 11 (3) Sequence Number: - Start / End Page: 697 - 708 Identifier: CoNE: https://publications.pik-potsdam.de/cone/journals/resource/1402282
Publisher: Copernicus