and Society (CLICCS)
1.5-degree Goal not plausibleSocial change more important than physical tipping points
1 February 2023, by Ute Kreis
Photo: CLICCS / Universität Hamburg
Limiting global warming to 1.5 degrees Celsius is currently not plausible, as is shown in a new, central study released by Universität Hamburg’s Cluster of Excellence “Climate, Climatic Change, and Society” (CLICCS). Climate policy, protests, and the Ukraine crisis: the participating researchers systematically assessed to what extent social changes are already underway – while also analyzing certain physical processes frequently discussed as tipping points. Their conclusion: social change is essential to meeting the temperature goals set in Paris. But what has been achieved to date is insufficient. Accordingly, climate adaptation will also have to be approached from a new angle.
The interdisciplinary team of researchers addressed ten important drivers of social change: “Actually, when it comes to climate protection, some things have now been set in motion. But if you look at the development of social processes in detail, keeping global warming under 1.5 degrees still isn’t plausible,” says CLICCS Speaker Prof. Anita Engels. According to the Hamburg Climate Futures Outlook, especially consumption patterns and corporate responses are slowing urgently needed climate protection measures. Other key factors like UN climate policy, legislation, climate protests and divestment from the fossil fuels are supporting efforts to meet the climate goals. As the analysis shows, however, this positive dynamic alone won’t suffice to stay within the 1.5-degree limit. “The deep decarbonization required is simply progressing too slowly,” says Engels.
In addition, the team assesses certain physical processes that are frequently discussed as tipping points: the loss of the Arctic sea ice and melting ice sheets are serious developments – as are regional climate changes. But they will have very little influence on the global temperature until 2050. In this regard, a thawing permafrost, weakened Atlantic Meridional Overturning Circulation (AMOC), and the loss of the Amazon Forest are more important factors – albeit only moderately. “The Fact is: these feared tipping points could drastically change the conditions for life on Earth – but they’re largely irrelevant for reaching the Paris Agreement temperature goals,” explains CLICCS Co-Speaker Prof. Jochem Marotzke from the Max Planck Institute for Meteorology.
The study also coveres COVID-19 and the Russian invasion of Ukraine: economic reconstruction programs have reinforced dependence on fossil fuels, which means the necessary changes are now less plausible than previously assumed. In contrast, whether efforts to safeguard Europe’s power supply and the international community’s attempts to become independent of Russian gas will undermine or accelerate the phasing out of fossil fuels in the long run remains unclear.
Importance of human agency, new approach to adaptation
The Outlook is currently the only assessment that interlinks social sciences and natural sciences analysis in an integrated study to assess the plausibility of certain climate futures. More than 60 experts have contributed. According to the study, the best hope for shaping a positive climate future lies in the ability of society to make fundamental changes (“human agency”). In addition, the Outlook reveals a range of conditions for doing so, for instance that transnational initiatives and non-government actors continue to support climate protection, and that protests keep up the pressure on politicians.
“The question of what is not just theoretically possible, but also plausible, that is, can realistically be expected, offers us new points of departure,” says Anita Engels. “If we fail to meet the climate goals, adapting to the impacts will become all the more important.” In this regard, the Hamburg Climate Futures Outlook introduces a new tool for testing the long-term effects of various measures. They need to do more than provide support once the crisis strikes: “In order to be equipped for a warmer world, we have to anticipate changes, get the affected parties on board, and take advantage of local knowledge. Instead of just reacting, we need to begin an active transformation here and now.”
Anita Engels; Jochem Marotzke; Eduardo Gonçalves Gresse; Andrés López-Rivera; Anna Pagnone; Jan Wilkens (eds.) (2023): Hamburg Climate Futures Outlook 2023. The plausibility of a 1.5°C limit to global warming – Social drivers and physical processes; Cluster of Excellence Climate, Climatic Change, and Society (CLICCS). Hamburg, Germany; DOI: 10.25592/uhhfdm.11230
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You can find further graphics for download on the
Hamburg Climate Futures Outlook 2023-Webseite.
All credits: CLICCS / Universität Hamburg
Cover illustration of the Hamburg Climate Future Outlook 2023
Results: The path toward climate goals
Caption: The path toward climate goals
The plausibility assessments indicate where social drivers and physical processes position themselves on the path toward the climate future scenario in which global climate mitigation goals are attained. Drivers and processes situated in the gray area are ambivalent with regard to reaching deep decarbonization by 2050 (social drivers), or do not affect the plausibility of attaining the Paris Agreement temperature goals (PAtg) (physical processes). Several social drivers are positioned closer to the goals as they support decarbonization (light blue area). However, the path toward climate goals is obstructed by physical processes which moderately inhibit the plausibility of attaining the Paris Agreement temperature goals (light red hexagon), and even more by social drivers which inhibit decarbonization (red hexagon). Currently, no social driver positions itself on the path of supporting deep decarbonization. More information can be found in Tables 1 and 2 and in the assessments in Chapter 6.
About the Hamburg Climate Futures Outlook
63 researchers from the Cluster of Excellence CLICCS were contributing authors to the Hamburg Climate Futures Outlook. They hail from various disciplines of the natural and social sciences, economics and law. Over 20 reviewers from Germany and abroad checked their work. In the CLICCS Plausibility Assessment Framework, the Cluster evaluated ten social drivers and expanded its scientific method to include six additional physical processes.
The Hamburg Climate Futures Outlook is released annually. It analyzes physical and social dynamics and assesses which climate futures are not just possible, but plausible.
Universität Hamburg’s Cluster of Excellence Climate, Climatic Change, and Society (CLICCS) is supported by the German Research Foundation (DFG). Based at Universität Hamburg’s Center for Earth System Research and Sustainability (CEN), it works in close collaboration with eleven partner institutes, including the Max Planck Institute for Meteorology in Hamburg, the Helmholtz Centre Hereon and the German Climate Computing Center.
Your contact partners for questions:
Prof. Dr. Anita Engels
Universität Hamburg
Center for Earth System Research and Sustainability (CEN)
Cluster of Excellence Climate, Climatic Change, and Society (CLICCS)
Tel: +49 (0) 40 42838 3832
Email: anita.engels"AT"uni-hamburg.de
Prof. Dr. Jochem Marotzke
Max Planck Institute for Meteorology
Cluster of Excellence Climate, Climatic Change, and Society (CLICCS)
Tel: +49 (0) 40 41173 440
Email: jochem.marotzke"AT"mpimet.mpg.de
Stephanie Janssen
Press and Outreach (CEN/CLICCS)
Universität Hamburg
Center for Earth System Research and Sustainability (CEN)
Cluster of Excellence Climate, Climatic Change, and Society (CLICCS)
Tel: +49 (0) 40 42838 7596
Email: stephanie.janssen"AT"uni-hamburg.de