Preprints
https://doi.org/10.31223/X5MQ4R
https://doi.org/10.31223/X5MQ4R
29 Oct 2024
 | 29 Oct 2024

Food trade disruption after global catastrophes

Florian Jehn, Łukasz Gajewski, Johanna Hedlund, Constantin Arnscheidt, Lili Xia, Nico Wunderling, and David Denkenberger

Abstract. The global food trade system is resilient to minor disruptions but vulnerable to major ones. Major shocks can arise from global catastrophic risks, such as abrupt sunlight reduction scenarios (e.g., nuclear war) or global catastrophic infrastructure loss (e.g., due to severe geomagnetic storms or a global pandemic). We use a network model to examine how these two scenarios could impact global food trade, focusing on wheat, maize, soybeans, and rice, accounting for about 60 % of global calorie intake. Our findings indicate that an abrupt sunlight reduction scenario, with soot emissions equivalent to a major nuclear war between India and Pakistan (37 Tg), could severely disrupt trade, causing most countries to lose the vast majority of their food imports (50–100 % decrease), primarily due to the main exporting countries being heavily affected. Global catastrophic infrastructure loss of the same magnitude as the abrupt sunlight reduction has a more homogeneous distribution of yield declines, resulting in most countries losing up to half of their food imports (25–50 % decrease). Thus, our analysis shows that both scenarios could significantly impact the food trade. However, the abrupt sunlight reduction scenario is likely more disruptive than global catastrophic infrastructure loss regarding the effects of yield reductions on food trade. This study underscores the vulnerabilities of the global food trade network to catastrophic risks and the need for enhanced preparedness.

Share

Journal article(s) based on this preprint

30 Sep 2025
| Highlight paper
Food trade disruption after global catastrophes
Florian Ulrich Jehn, Łukasz G. Gajewski, Johanna Hedlund, Constantin W. Arnscheidt, Lili Xia, Nico Wunderling, and David Denkenberger
Earth Syst. Dynam., 16, 1585–1603, https://doi.org/10.5194/esd-16-1585-2025,https://doi.org/10.5194/esd-16-1585-2025, 2025
Short summary Chief editor
Florian Jehn, Łukasz Gajewski, Johanna Hedlund, Constantin Arnscheidt, Lili Xia, Nico Wunderling, and David Denkenberger

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-3094', Nick Wilson, 20 Dec 2024
    • AC1: 'Reply on RC1', Florian Ulrich Jehn, 15 May 2025
  • RC2: 'Comment on egusphere-2024-3094', Kilian Kuhla, 05 May 2025
    • AC2: 'Reply on RC2', Florian Ulrich Jehn, 15 May 2025

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-3094', Nick Wilson, 20 Dec 2024
    • AC1: 'Reply on RC1', Florian Ulrich Jehn, 15 May 2025
  • RC2: 'Comment on egusphere-2024-3094', Kilian Kuhla, 05 May 2025
    • AC2: 'Reply on RC2', Florian Ulrich Jehn, 15 May 2025

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
ED: Reconsider after major revisions (18 May 2025) by Somnath Baidya Roy
AR by Florian Ulrich Jehn on behalf of the Authors (19 May 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (05 Jun 2025) by Somnath Baidya Roy
RR by Kilian Kuhla (01 Jul 2025)
ED: Publish as is (02 Jul 2025) by Somnath Baidya Roy
ED: Publish as is (02 Jul 2025) by Axel Kleidon (Chief editor)
AR by Florian Ulrich Jehn on behalf of the Authors (09 Jul 2025)  Manuscript 

Journal article(s) based on this preprint

30 Sep 2025
| Highlight paper
Food trade disruption after global catastrophes
Florian Ulrich Jehn, Łukasz G. Gajewski, Johanna Hedlund, Constantin W. Arnscheidt, Lili Xia, Nico Wunderling, and David Denkenberger
Earth Syst. Dynam., 16, 1585–1603, https://doi.org/10.5194/esd-16-1585-2025,https://doi.org/10.5194/esd-16-1585-2025, 2025
Short summary Chief editor
Florian Jehn, Łukasz Gajewski, Johanna Hedlund, Constantin Arnscheidt, Lili Xia, Nico Wunderling, and David Denkenberger

Model code and software

PyTradeShifts Florian Ulrich Jehn and Lukasz G. Gajewski https://github.com/allfed/pytradeshifts

Florian Jehn, Łukasz Gajewski, Johanna Hedlund, Constantin Arnscheidt, Lili Xia, Nico Wunderling, and David Denkenberger

Viewed

Since the preprint corresponding to this journal article was posted outside of Copernicus Publications, the preprint-related metrics are limited to HTML views.

Total article views: 640 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
635 0 5 640 0 0
  • HTML: 635
  • PDF: 0
  • XML: 5
  • Total: 640
  • BibTeX: 0
  • EndNote: 0
Views and downloads (calculated since 29 Oct 2024)
Cumulative views and downloads (calculated since 29 Oct 2024)

Viewed (geographical distribution)

Since the preprint corresponding to this journal article was posted outside of Copernicus Publications, the preprint-related metrics are limited to HTML views.

Total article views: 621 (including HTML, PDF, and XML) Thereof 621 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Latest update: 30 Sep 2025
Download

The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

Short summary
The global food trade system can handle small disturbances, but large disasters could cause major disruptions. We looked at how nuclear war or severe infrastructure loss would affect global trade in key crops. Both would be catastrophic, but a nuclear war would cause more severe disruptions, with many countries losing most of their food imports. Both scenarios highlight the need for better preparation to protect global food security.
Share