Polycrisis Resilience in the 21st Century

Abstract

Polycrisis Resilience is a framework for understanding and reducing vulnerability to the interconnected global crises shaping the twenty-first century, including climate change, pollution, poverty, resource insecurity, conflict, institutional fragility, technological dependence, and infrastructure weakness. This report argues that the severity of these crises depends not only on the hazards themselves but also on the vulnerability of the populations and systems exposed to them. Drawing on evidence from 217 economies and public international datasets, it shows that many of the vulnerabilities associated with the global polycrisis are strongly linked to development outcomes such as access to energy, health care, sanitation, education, digital connectivity, and effective institutions. The report introduces the H Heuristics Polycrisis Resilience Framework, which defines resilience as the capacity of individuals, communities, institutions, economies, and interconnected systems to anticipate, withstand, adapt to, recover from, and reduce vulnerability to multiple interacting crises. The framework identifies ten development pathways, including clean energy transition, technology diffusion, climate adaptation, human development, infrastructure strengthening, public health, institutional capacity, economic diversification, food and water security, and digital infrastructure. These pathways are presented as mutually reinforcing mechanisms for reducing both human and systemic vulnerability. Using century-scale scenarios for 2026-2100, the report demonstrates how sustained development can substantially reduce exposure to interconnected risks. It concludes that Polycrisis Resilience is fundamentally a long-term strategy of vulnerability reduction, in which development, technological progress, environmental improvement, and institutional strengthening work together to improve human well-being while reducing the potential for cascading global crises.

Key findings

1. Hazard and vulnerability are different things, and only one of them is mostly a matter of development. Across 160 countries, exposure to climate hazards has almost no link to national income (correlation 0.04), while child mortality, sanitation, clean cooking, institutions and connectivity are all tightly tied to it (0.8 or more in absolute value). Where hazards strike is set by geography. How much harm they do is set by how people live.
2. The century's vulnerabilities travel together, and mostly because of poverty. Across countries the average link between vulnerabilities is 0.51; hold income fixed and it falls to 0.24, less than half. 19% of countries are in the worst fifth on four or more of seven challenges, against 4% if the challenges were independent.
3. Vulnerability has already fallen at historic scale. Deaths before age five dropped from 178 to 37 per 1,000 births between 1960 and 2024. Climate-related disaster deaths averaged 10 per 100,000 people a year in the 1960s and 0.26 in the 2010s. Electricity access rose from 78% to 92% and clean cooking from 48% to 75% since 2000.
4. The remaining gaps are concentrated and large. About 655 million people lack electricity, 2.0 billion lack clean cooking and 1.5 billion lack basic sanitation, and Africa holds 89% of the first of these. Seventy percent of Africans, and almost all people in low-income countries, live where four or more challenges overlap.
5. Demography will make development a race. If access to services never improved, population growth alone would raise the number of people without clean cooking from 2.0 billion to 4.0 billion by 2100. Development decides whether that number is 1.7 billion (current pace) or 86 million (best-peer pace).
6. Ten development pathways work on several vulnerabilities at once. Clean energy, technology diffusion, adaptation, human development, infrastructure, public health, institutions, diversification, food and water security, and digital infrastructure support one another and can be pursued as one strategy.
7. Prevention is usually cheaper than response, but not everywhere. Reported benefit-cost ratios of 2:1 to more than 10:1 apply to adaptation and resilient infrastructure; each project still has to be tested locally.
8. Impact can be measured. Eight measures, from exposure and climate vulnerability to avoided losses and cascading risk, give a century scorecard with baselines today. The scenarios are arithmetic illustrations, not forecasts.

Contents

1. Executive SummaryVulnerability can be reduced, and most of the tools are development toolsp. 4
2. 1The Emergence of the Global Polycrisisp. 6
3. 2Climate, Pollution and Human Healthp. 9
4. 3Poverty, Inequality and Resource Insecurityp. 12
5. 4Conflict, Institutions and Technological Dependencep. 14
6. 5Defining Polycrisis Resiliencep. 17
7. 6Development, Prevention and Interconnected Solutionsp. 20
8. 7The H Heuristics Framework: Ten Development Pathwaysp. 24
9. 8Regional and Global Applicationsp. 27
10. 9The Century-Scale Outlook, 2026–2100p. 31
11. 10Measuring the Impactp. 35
12. 11Conclusion: The Central Thesisp. 38
13. Referencesp. 40

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How to cite

@techreport{hughes2026polycrisis,
  title = {Polycrisis Resilience in the 21st Century: Reducing human and systemic vulnerability to interconnected global crises},
  author = {Hughes, Hunter},
  institution = {H Heuristics},
  type = {Research Report},
  series = {H Heuristics Polycrisis Resilience Series},
  number = {9},
  year = {2026},
  month = nov,
  doi = {10.6084/m9.figshare.34942807},
  url = {https://doi.org/10.6084/m9.figshare.34942807},
  copyright = {CC BY-NC-ND 4.0},
  keywords = {polycrisis resilience, global polycrisis, vulnerability reduction, development as risk reduction, ten development pathways, technology diffusion, climate adaptation, air pollution, clean cooking, demography and development, scenarios to 2100, Polycrisis Resilience Index, H Heuristics Polycrisis Resilience Framework}
}

Download citation: BibTeX (.bib) · RIS (.ris) · https://doi.org/10.6084/m9.figshare.34942807

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